131 lines
5.4 KiB
C++
Executable File
131 lines
5.4 KiB
C++
Executable File
/*******************************************************************************************[Vec.h]
|
|
Copyright (c) 2003-2007, Niklas Een, Niklas Sorensson
|
|
Copyright (c) 2007-2010, Niklas Sorensson
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
|
|
associated documentation files (the "Software"), to deal in the Software without restriction,
|
|
including without limitation the rights to use, copy, modify, merge, publish, distribute,
|
|
sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in all copies or
|
|
substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
|
|
NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
|
|
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
|
|
OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
**************************************************************************************************/
|
|
|
|
#ifndef Minisat_Vec_h
|
|
#define Minisat_Vec_h
|
|
|
|
#include <assert.h>
|
|
#include <new>
|
|
|
|
#include "mtl/IntTypes.h"
|
|
#include "mtl/XAlloc.h"
|
|
|
|
namespace Minisat {
|
|
|
|
//=================================================================================================
|
|
// Automatically resizable arrays
|
|
//
|
|
// NOTE! Don't use this vector on datatypes that cannot be re-located in memory (with realloc)
|
|
|
|
template<class T>
|
|
class vec {
|
|
T* data;
|
|
int sz;
|
|
int cap;
|
|
|
|
// Don't allow copying (error prone):
|
|
vec<T>& operator = (vec<T>& other) { assert(0); return *this; }
|
|
vec (vec<T>& other) { assert(0); }
|
|
|
|
// Helpers for calculating next capacity:
|
|
static inline int imax (int x, int y) { int mask = (y-x) >> (sizeof(int)*8-1); return (x&mask) + (y&(~mask)); }
|
|
//static inline void nextCap(int& cap){ cap += ((cap >> 1) + 2) & ~1; }
|
|
static inline void nextCap(int& cap){ cap += ((cap >> 1) + 2) & ~1; }
|
|
|
|
public:
|
|
// Constructors:
|
|
vec() : data(NULL) , sz(0) , cap(0) { }
|
|
explicit vec(int size) : data(NULL) , sz(0) , cap(0) { growTo(size); }
|
|
vec(int size, const T& pad) : data(NULL) , sz(0) , cap(0) { growTo(size, pad); }
|
|
~vec() { clear(true); }
|
|
|
|
// Pointer to first element:
|
|
operator T* (void) { return data; }
|
|
|
|
// Size operations:
|
|
int size (void) const { return sz; }
|
|
void shrink (int nelems) { assert(nelems <= sz); for (int i = 0; i < nelems; i++) sz--, data[sz].~T(); }
|
|
void shrink_ (int nelems) { assert(nelems <= sz); sz -= nelems; }
|
|
int capacity (void) const { return cap; }
|
|
void capacity (int min_cap);
|
|
void growTo (int size);
|
|
void growTo (int size, const T& pad);
|
|
void clear (bool dealloc = false);
|
|
|
|
// Stack interface:
|
|
void push (void) { if (sz == cap) capacity(sz+1); new (&data[sz]) T(); sz++; }
|
|
void push (const T& elem) { if (sz == cap) capacity(sz+1); data[sz++] = elem; }
|
|
void push_ (const T& elem) { assert(sz < cap); data[sz++] = elem; }
|
|
void pop (void) { assert(sz > 0); sz--, data[sz].~T(); }
|
|
// NOTE: it seems possible that overflow can happen in the 'sz+1' expression of 'push()', but
|
|
// in fact it can not since it requires that 'cap' is equal to INT_MAX. This in turn can not
|
|
// happen given the way capacities are calculated (below). Essentially, all capacities are
|
|
// even, but INT_MAX is odd.
|
|
|
|
const T& last (void) const { return data[sz-1]; }
|
|
T& last (void) { return data[sz-1]; }
|
|
|
|
// Vector interface:
|
|
const T& operator [] (int index) const { return data[index]; }
|
|
T& operator [] (int index) { return data[index]; }
|
|
|
|
// Duplicatation (preferred instead):
|
|
void copyTo(vec<T>& copy) const { copy.clear(); copy.growTo(sz); for (int i = 0; i < sz; i++) copy[i] = data[i]; }
|
|
void moveTo(vec<T>& dest) { dest.clear(true); dest.data = data; dest.sz = sz; dest.cap = cap; data = NULL; sz = 0; cap = 0; }
|
|
};
|
|
|
|
|
|
template<class T>
|
|
void vec<T>::capacity(int min_cap) {
|
|
if (cap >= min_cap) return;
|
|
int add = imax((min_cap - cap + 1) & ~1, ((cap >> 1) + 2) & ~1); // NOTE: grow by approximately 3/2
|
|
if (add > INT_MAX - cap || ((data = (T*)::realloc(data, (cap += add) * sizeof(T))) == NULL) && errno == ENOMEM)
|
|
throw OutOfMemoryException();
|
|
}
|
|
|
|
|
|
template<class T>
|
|
void vec<T>::growTo(int size, const T& pad) {
|
|
if (sz >= size) return;
|
|
capacity(size);
|
|
for (int i = sz; i < size; i++) data[i] = pad;
|
|
sz = size; }
|
|
|
|
|
|
template<class T>
|
|
void vec<T>::growTo(int size) {
|
|
if (sz >= size) return;
|
|
capacity(size);
|
|
for (int i = sz; i < size; i++) new (&data[i]) T();
|
|
sz = size; }
|
|
|
|
|
|
template<class T>
|
|
void vec<T>::clear(bool dealloc) {
|
|
if (data != NULL){
|
|
for (int i = 0; i < sz; i++) data[i].~T();
|
|
sz = 0;
|
|
if (dealloc) free(data), data = NULL, cap = 0; } }
|
|
|
|
//=================================================================================================
|
|
}
|
|
|
|
#endif
|