584 lines
17 KiB
C
584 lines
17 KiB
C
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#ifndef GOOGLE_PROTOBUF_STUBS_CALLBACK_H_
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#define GOOGLE_PROTOBUF_STUBS_CALLBACK_H_
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#include <type_traits>
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#include <google/protobuf/stubs/macros.h>
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#include <google/protobuf/port_def.inc>
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// ===================================================================
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// emulates google3/base/callback.h
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namespace google {
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namespace protobuf {
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// Abstract interface for a callback. When calling an RPC, you must provide
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// a Closure to call when the procedure completes. See the Service interface
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// in service.h.
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//
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// To automatically construct a Closure which calls a particular function or
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// method with a particular set of parameters, use the NewCallback() function.
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// Example:
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// void FooDone(const FooResponse* response) {
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// ...
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// }
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//
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// void CallFoo() {
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// ...
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// // When done, call FooDone() and pass it a pointer to the response.
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// Closure* callback = NewCallback(&FooDone, response);
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// // Make the call.
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// service->Foo(controller, request, response, callback);
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// }
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//
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// Example that calls a method:
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// class Handler {
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// public:
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// ...
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//
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// void FooDone(const FooResponse* response) {
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// ...
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// }
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//
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// void CallFoo() {
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// ...
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// // When done, call FooDone() and pass it a pointer to the response.
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// Closure* callback = NewCallback(this, &Handler::FooDone, response);
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// // Make the call.
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// service->Foo(controller, request, response, callback);
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// }
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// };
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//
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// Currently NewCallback() supports binding zero, one, or two arguments.
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//
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// Callbacks created with NewCallback() automatically delete themselves when
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// executed. They should be used when a callback is to be called exactly
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// once (usually the case with RPC callbacks). If a callback may be called
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// a different number of times (including zero), create it with
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// NewPermanentCallback() instead. You are then responsible for deleting the
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// callback (using the "delete" keyword as normal).
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//
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// Note that NewCallback() is a bit touchy regarding argument types. Generally,
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// the values you provide for the parameter bindings must exactly match the
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// types accepted by the callback function. For example:
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// void Foo(string s);
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// NewCallback(&Foo, "foo"); // WON'T WORK: const char* != string
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// NewCallback(&Foo, string("foo")); // WORKS
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// Also note that the arguments cannot be references:
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// void Foo(const string& s);
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// string my_str;
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// NewCallback(&Foo, my_str); // WON'T WORK: Can't use references.
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// However, correctly-typed pointers will work just fine.
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class PROTOBUF_EXPORT Closure {
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public:
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Closure() {}
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virtual ~Closure();
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virtual void Run() = 0;
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private:
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GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Closure);
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};
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template<typename R>
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class ResultCallback {
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public:
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ResultCallback() {}
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virtual ~ResultCallback() {}
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virtual R Run() = 0;
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private:
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GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ResultCallback);
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};
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template <typename R, typename A1>
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class PROTOBUF_EXPORT ResultCallback1 {
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public:
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ResultCallback1() {}
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virtual ~ResultCallback1() {}
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virtual R Run(A1) = 0;
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private:
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GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ResultCallback1);
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};
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template <typename R, typename A1, typename A2>
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class PROTOBUF_EXPORT ResultCallback2 {
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public:
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ResultCallback2() {}
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virtual ~ResultCallback2() {}
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virtual R Run(A1,A2) = 0;
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private:
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GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ResultCallback2);
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};
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namespace internal {
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class PROTOBUF_EXPORT FunctionClosure0 : public Closure {
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public:
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typedef void (*FunctionType)();
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FunctionClosure0(FunctionType function, bool self_deleting)
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: function_(function), self_deleting_(self_deleting) {}
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~FunctionClosure0();
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void Run() override {
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bool needs_delete = self_deleting_; // read in case callback deletes
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function_();
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if (needs_delete) delete this;
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}
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private:
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FunctionType function_;
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bool self_deleting_;
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};
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template <typename Class>
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class MethodClosure0 : public Closure {
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public:
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typedef void (Class::*MethodType)();
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MethodClosure0(Class* object, MethodType method, bool self_deleting)
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: object_(object), method_(method), self_deleting_(self_deleting) {}
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~MethodClosure0() {}
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void Run() override {
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bool needs_delete = self_deleting_; // read in case callback deletes
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(object_->*method_)();
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if (needs_delete) delete this;
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}
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private:
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Class* object_;
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MethodType method_;
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bool self_deleting_;
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};
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template <typename Arg1>
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class FunctionClosure1 : public Closure {
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public:
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typedef void (*FunctionType)(Arg1 arg1);
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FunctionClosure1(FunctionType function, bool self_deleting,
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Arg1 arg1)
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: function_(function), self_deleting_(self_deleting),
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arg1_(arg1) {}
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~FunctionClosure1() {}
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void Run() override {
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bool needs_delete = self_deleting_; // read in case callback deletes
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function_(arg1_);
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if (needs_delete) delete this;
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}
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private:
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FunctionType function_;
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bool self_deleting_;
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Arg1 arg1_;
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};
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template <typename Class, typename Arg1>
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class MethodClosure1 : public Closure {
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public:
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typedef void (Class::*MethodType)(Arg1 arg1);
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MethodClosure1(Class* object, MethodType method, bool self_deleting,
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Arg1 arg1)
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: object_(object), method_(method), self_deleting_(self_deleting),
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arg1_(arg1) {}
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~MethodClosure1() {}
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void Run() override {
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bool needs_delete = self_deleting_; // read in case callback deletes
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(object_->*method_)(arg1_);
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if (needs_delete) delete this;
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}
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private:
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Class* object_;
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MethodType method_;
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bool self_deleting_;
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Arg1 arg1_;
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};
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template <typename Arg1, typename Arg2>
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class FunctionClosure2 : public Closure {
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public:
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typedef void (*FunctionType)(Arg1 arg1, Arg2 arg2);
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FunctionClosure2(FunctionType function, bool self_deleting,
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Arg1 arg1, Arg2 arg2)
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: function_(function), self_deleting_(self_deleting),
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arg1_(arg1), arg2_(arg2) {}
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~FunctionClosure2() {}
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void Run() override {
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bool needs_delete = self_deleting_; // read in case callback deletes
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function_(arg1_, arg2_);
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if (needs_delete) delete this;
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}
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private:
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FunctionType function_;
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bool self_deleting_;
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Arg1 arg1_;
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Arg2 arg2_;
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};
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template <typename Class, typename Arg1, typename Arg2>
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class MethodClosure2 : public Closure {
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public:
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typedef void (Class::*MethodType)(Arg1 arg1, Arg2 arg2);
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MethodClosure2(Class* object, MethodType method, bool self_deleting,
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Arg1 arg1, Arg2 arg2)
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: object_(object), method_(method), self_deleting_(self_deleting),
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arg1_(arg1), arg2_(arg2) {}
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~MethodClosure2() {}
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void Run() override {
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bool needs_delete = self_deleting_; // read in case callback deletes
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(object_->*method_)(arg1_, arg2_);
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if (needs_delete) delete this;
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}
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private:
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Class* object_;
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MethodType method_;
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bool self_deleting_;
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Arg1 arg1_;
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Arg2 arg2_;
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};
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template<typename R>
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class FunctionResultCallback_0_0 : public ResultCallback<R> {
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public:
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typedef R (*FunctionType)();
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FunctionResultCallback_0_0(FunctionType function, bool self_deleting)
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: function_(function), self_deleting_(self_deleting) {}
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~FunctionResultCallback_0_0() {}
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R Run() override {
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bool needs_delete = self_deleting_; // read in case callback deletes
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R result = function_();
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if (needs_delete) delete this;
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return result;
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}
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private:
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FunctionType function_;
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bool self_deleting_;
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};
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template<typename R, typename P1>
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class FunctionResultCallback_1_0 : public ResultCallback<R> {
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public:
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typedef R (*FunctionType)(P1);
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FunctionResultCallback_1_0(FunctionType function, bool self_deleting,
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P1 p1)
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: function_(function), self_deleting_(self_deleting), p1_(p1) {}
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~FunctionResultCallback_1_0() {}
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R Run() override {
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bool needs_delete = self_deleting_; // read in case callback deletes
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R result = function_(p1_);
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if (needs_delete) delete this;
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return result;
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}
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private:
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FunctionType function_;
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bool self_deleting_;
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P1 p1_;
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};
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template<typename R, typename Arg1>
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class FunctionResultCallback_0_1 : public ResultCallback1<R, Arg1> {
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public:
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typedef R (*FunctionType)(Arg1 arg1);
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FunctionResultCallback_0_1(FunctionType function, bool self_deleting)
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: function_(function), self_deleting_(self_deleting) {}
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~FunctionResultCallback_0_1() {}
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R Run(Arg1 a1) override {
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bool needs_delete = self_deleting_; // read in case callback deletes
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R result = function_(a1);
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if (needs_delete) delete this;
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return result;
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}
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private:
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FunctionType function_;
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bool self_deleting_;
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};
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template<typename R, typename P1, typename A1>
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class FunctionResultCallback_1_1 : public ResultCallback1<R, A1> {
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public:
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typedef R (*FunctionType)(P1, A1);
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FunctionResultCallback_1_1(FunctionType function, bool self_deleting,
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P1 p1)
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: function_(function), self_deleting_(self_deleting), p1_(p1) {}
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~FunctionResultCallback_1_1() {}
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R Run(A1 a1) override {
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bool needs_delete = self_deleting_; // read in case callback deletes
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R result = function_(p1_, a1);
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if (needs_delete) delete this;
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return result;
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}
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private:
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FunctionType function_;
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bool self_deleting_;
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P1 p1_;
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};
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template <typename T>
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struct InternalConstRef {
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typedef typename std::remove_reference<T>::type base_type;
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typedef const base_type& type;
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};
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||
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template<typename R, typename T>
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class MethodResultCallback_0_0 : public ResultCallback<R> {
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public:
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typedef R (T::*MethodType)();
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MethodResultCallback_0_0(T* object, MethodType method, bool self_deleting)
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: object_(object),
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method_(method),
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self_deleting_(self_deleting) {}
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~MethodResultCallback_0_0() {}
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R Run() {
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bool needs_delete = self_deleting_;
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||
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R result = (object_->*method_)();
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if (needs_delete) delete this;
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return result;
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}
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||
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|
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||
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private:
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||
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T* object_;
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MethodType method_;
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bool self_deleting_;
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};
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||
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template <typename R, typename T, typename P1, typename P2, typename P3,
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typename P4, typename P5, typename P6, typename A1, typename A2>
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||
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class MethodResultCallback_6_2 : public ResultCallback2<R, A1, A2> {
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||
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public:
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||
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typedef R (T::*MethodType)(P1, P2, P3, P4, P5, P6, A1, A2);
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MethodResultCallback_6_2(T* object, MethodType method, bool self_deleting,
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||
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P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6)
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||
|
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: object_(object),
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||
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method_(method),
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||
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self_deleting_(self_deleting),
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||
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p1_(p1),
|
||
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p2_(p2),
|
||
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p3_(p3),
|
||
|
|
p4_(p4),
|
||
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p5_(p5),
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||
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p6_(p6) {}
|
||
|
|
~MethodResultCallback_6_2() {}
|
||
|
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|
||
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R Run(A1 a1, A2 a2) override {
|
||
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bool needs_delete = self_deleting_;
|
||
|
|
R result = (object_->*method_)(p1_, p2_, p3_, p4_, p5_, p6_, a1, a2);
|
||
|
|
if (needs_delete) delete this;
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
T* object_;
|
||
|
|
MethodType method_;
|
||
|
|
bool self_deleting_;
|
||
|
|
typename std::remove_reference<P1>::type p1_;
|
||
|
|
typename std::remove_reference<P2>::type p2_;
|
||
|
|
typename std::remove_reference<P3>::type p3_;
|
||
|
|
typename std::remove_reference<P4>::type p4_;
|
||
|
|
typename std::remove_reference<P5>::type p5_;
|
||
|
|
typename std::remove_reference<P6>::type p6_;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace internal
|
||
|
|
|
||
|
|
// See Closure.
|
||
|
|
inline Closure* NewCallback(void (*function)()) {
|
||
|
|
return new internal::FunctionClosure0(function, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See Closure.
|
||
|
|
inline Closure* NewPermanentCallback(void (*function)()) {
|
||
|
|
return new internal::FunctionClosure0(function, false);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See Closure.
|
||
|
|
template <typename Class>
|
||
|
|
inline Closure* NewCallback(Class* object, void (Class::*method)()) {
|
||
|
|
return new internal::MethodClosure0<Class>(object, method, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See Closure.
|
||
|
|
template <typename Class>
|
||
|
|
inline Closure* NewPermanentCallback(Class* object, void (Class::*method)()) {
|
||
|
|
return new internal::MethodClosure0<Class>(object, method, false);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See Closure.
|
||
|
|
template <typename Arg1>
|
||
|
|
inline Closure* NewCallback(void (*function)(Arg1),
|
||
|
|
Arg1 arg1) {
|
||
|
|
return new internal::FunctionClosure1<Arg1>(function, true, arg1);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See Closure.
|
||
|
|
template <typename Arg1>
|
||
|
|
inline Closure* NewPermanentCallback(void (*function)(Arg1),
|
||
|
|
Arg1 arg1) {
|
||
|
|
return new internal::FunctionClosure1<Arg1>(function, false, arg1);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See Closure.
|
||
|
|
template <typename Class, typename Arg1>
|
||
|
|
inline Closure* NewCallback(Class* object, void (Class::*method)(Arg1),
|
||
|
|
Arg1 arg1) {
|
||
|
|
return new internal::MethodClosure1<Class, Arg1>(object, method, true, arg1);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See Closure.
|
||
|
|
template <typename Class, typename Arg1>
|
||
|
|
inline Closure* NewPermanentCallback(Class* object, void (Class::*method)(Arg1),
|
||
|
|
Arg1 arg1) {
|
||
|
|
return new internal::MethodClosure1<Class, Arg1>(object, method, false, arg1);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See Closure.
|
||
|
|
template <typename Arg1, typename Arg2>
|
||
|
|
inline Closure* NewCallback(void (*function)(Arg1, Arg2),
|
||
|
|
Arg1 arg1, Arg2 arg2) {
|
||
|
|
return new internal::FunctionClosure2<Arg1, Arg2>(
|
||
|
|
function, true, arg1, arg2);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See Closure.
|
||
|
|
template <typename Arg1, typename Arg2>
|
||
|
|
inline Closure* NewPermanentCallback(void (*function)(Arg1, Arg2),
|
||
|
|
Arg1 arg1, Arg2 arg2) {
|
||
|
|
return new internal::FunctionClosure2<Arg1, Arg2>(
|
||
|
|
function, false, arg1, arg2);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See Closure.
|
||
|
|
template <typename Class, typename Arg1, typename Arg2>
|
||
|
|
inline Closure* NewCallback(Class* object, void (Class::*method)(Arg1, Arg2),
|
||
|
|
Arg1 arg1, Arg2 arg2) {
|
||
|
|
return new internal::MethodClosure2<Class, Arg1, Arg2>(
|
||
|
|
object, method, true, arg1, arg2);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See Closure.
|
||
|
|
template <typename Class, typename Arg1, typename Arg2>
|
||
|
|
inline Closure* NewPermanentCallback(
|
||
|
|
Class* object, void (Class::*method)(Arg1, Arg2),
|
||
|
|
Arg1 arg1, Arg2 arg2) {
|
||
|
|
return new internal::MethodClosure2<Class, Arg1, Arg2>(
|
||
|
|
object, method, false, arg1, arg2);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See ResultCallback
|
||
|
|
template<typename R>
|
||
|
|
inline ResultCallback<R>* NewCallback(R (*function)()) {
|
||
|
|
return new internal::FunctionResultCallback_0_0<R>(function, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See ResultCallback
|
||
|
|
template<typename R>
|
||
|
|
inline ResultCallback<R>* NewPermanentCallback(R (*function)()) {
|
||
|
|
return new internal::FunctionResultCallback_0_0<R>(function, false);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See ResultCallback
|
||
|
|
template<typename R, typename P1>
|
||
|
|
inline ResultCallback<R>* NewCallback(R (*function)(P1), P1 p1) {
|
||
|
|
return new internal::FunctionResultCallback_1_0<R, P1>(
|
||
|
|
function, true, p1);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See ResultCallback
|
||
|
|
template<typename R, typename P1>
|
||
|
|
inline ResultCallback<R>* NewPermanentCallback(
|
||
|
|
R (*function)(P1), P1 p1) {
|
||
|
|
return new internal::FunctionResultCallback_1_0<R, P1>(
|
||
|
|
function, false, p1);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See ResultCallback1
|
||
|
|
template<typename R, typename A1>
|
||
|
|
inline ResultCallback1<R, A1>* NewCallback(R (*function)(A1)) {
|
||
|
|
return new internal::FunctionResultCallback_0_1<R, A1>(function, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See ResultCallback1
|
||
|
|
template<typename R, typename A1>
|
||
|
|
inline ResultCallback1<R, A1>* NewPermanentCallback(R (*function)(A1)) {
|
||
|
|
return new internal::FunctionResultCallback_0_1<R, A1>(function, false);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See ResultCallback1
|
||
|
|
template<typename R, typename P1, typename A1>
|
||
|
|
inline ResultCallback1<R, A1>* NewCallback(R (*function)(P1, A1), P1 p1) {
|
||
|
|
return new internal::FunctionResultCallback_1_1<R, P1, A1>(
|
||
|
|
function, true, p1);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See ResultCallback1
|
||
|
|
template<typename R, typename P1, typename A1>
|
||
|
|
inline ResultCallback1<R, A1>* NewPermanentCallback(
|
||
|
|
R (*function)(P1, A1), P1 p1) {
|
||
|
|
return new internal::FunctionResultCallback_1_1<R, P1, A1>(
|
||
|
|
function, false, p1);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See MethodResultCallback_0_0
|
||
|
|
template <typename R, typename T1, typename T2>
|
||
|
|
inline ResultCallback<R>* NewPermanentCallback(
|
||
|
|
T1* object, R (T2::*function)()) {
|
||
|
|
return new internal::MethodResultCallback_0_0<R, T1>(object, function, false);
|
||
|
|
}
|
||
|
|
|
||
|
|
// See MethodResultCallback_6_2
|
||
|
|
template <typename R, typename T, typename P1, typename P2, typename P3,
|
||
|
|
typename P4, typename P5, typename P6, typename A1, typename A2>
|
||
|
|
inline ResultCallback2<R, A1, A2>* NewPermanentCallback(
|
||
|
|
T* object, R (T::*function)(P1, P2, P3, P4, P5, P6, A1, A2),
|
||
|
|
typename internal::InternalConstRef<P1>::type p1,
|
||
|
|
typename internal::InternalConstRef<P2>::type p2,
|
||
|
|
typename internal::InternalConstRef<P3>::type p3,
|
||
|
|
typename internal::InternalConstRef<P4>::type p4,
|
||
|
|
typename internal::InternalConstRef<P5>::type p5,
|
||
|
|
typename internal::InternalConstRef<P6>::type p6) {
|
||
|
|
return new internal::MethodResultCallback_6_2<R, T, P1, P2, P3, P4, P5, P6,
|
||
|
|
A1, A2>(object, function, false,
|
||
|
|
p1, p2, p3, p4, p5, p6);
|
||
|
|
}
|
||
|
|
|
||
|
|
// A function which does nothing. Useful for creating no-op callbacks, e.g.:
|
||
|
|
// Closure* nothing = NewCallback(&DoNothing);
|
||
|
|
void PROTOBUF_EXPORT DoNothing();
|
||
|
|
|
||
|
|
} // namespace protobuf
|
||
|
|
} // namespace google
|
||
|
|
|
||
|
|
#include <google/protobuf/port_undef.inc>
|
||
|
|
|
||
|
|
#endif // GOOGLE_PROTOBUF_STUBS_CALLBACK_H_
|