[英]C++ std::vector iterators error
首先, 我對我的英語不好對不起 ,希望你們能理解我的意思。)我正在編寫WinAPI游戲,而我的類卻表現得很奇怪:所有帶有vector的操作都使我的程序崩潰,因此Windows表示我的.exe停止了工作。 但是,當我調試這些行時,會出現異常。
這是我的類標題的樣子:
#ifndef FIGURE_H_INCLUDED
#define FIGURE_H_INCLUDED
#include <vector>
#include <Windows.h>
#include "Other.h"
using namespace std;
enum Figure_Type { I, J, L, O, S, T, Z };
class Figure
{
public:
/* CONSTRUCTORS */
Figure();
Figure(Figure_Type);
/* MOVEMENT */
bool Move(vector<Cell>&, Direction&);
void Drop(vector<Cell>&);
bool Rotate(vector<Cell>&);
/* OTHER */
void Draw(HDC&);
private:
/* METHODS */
void Generate();
void GenerateMasks();
void GenerateFigure();
Figure GetFigureCopy() const;
/* DATA */
Shift shift;
char mask[4][4];
vector<Cell> vCells;
Figure_Type type;
int rotation;
};
#endif
我的構造函數正在使用Generate()方法,該代碼是:
void Figure::GenerateFigure()
{
vCells.clear();
int defPosX = 4,
defPosY = 20;
Cell cell;
for(int y = 0; y < 4; y++)
{
for(int x = 0; x < 4; x++)
{
if(mask[y][x] == '0')
{
cell.x = defPosX + x + shift.dx;
cell.y = defPosY - y + shift.dy;
vCells.push_back(cell);
}
}
}
}
我在vCells.clear()方法和(如果我注釋第一行)vCells.push_back(cell)行上遇到了異常。 實際上,使用矢量/矢量迭代器進行的每個操作都使我的程序崩潰,甚至沒有增加迭代器,這些只是第一個操作,因此我的代碼不再在它們之后運行。 例外文字:
“ Tetris_completely_new.exe中0x5A4ACCD2(msvcp110d.dll)的未處理異常:0xC000041D:用戶回調期間遇到未處理的異常。
並且這些異常引發了217的“ xutility”行。 我評論了:
....
// MEMBER FUNCTIONS FOR _Container_base12
inline void _Container_base12::_Orphan_all()
{ // orphan all iterators
#if _ITERATOR_DEBUG_LEVEL == 2
if (_Myproxy != 0)
{ // proxy allocated, drain it
_Lockit _Lock(_LOCK_DEBUG);
for (_Iterator_base12 **_Pnext = &_Myproxy->_Myfirstiter;
*_Pnext != 0; *_Pnext = (*_Pnext)->_Mynextiter)
**(*_Pnext)->_Myproxy = 0;** // <------------ THIS LINE
_Myproxy->_Myfirstiter = 0;
}
#endif /* _ITERATOR_DEBUG_LEVEL == 2 */
}
....
這是我的Cell結構的樣子:
struct Cell
{
Cell() : x(1), y(1) { }
Cell(int _x, int _y): x(_x), y(_y) { }
void Draw(HDC&) const;
bool operator ==(const Cell& a) const { return (x == a.x && y == a.y); }
bool operator !=(const Cell& a) const { return !(*this == a); }
int x;
int y;
};
和圖構造函數 :
Figure::Figure()
{
srand(time(NULL));
vCells.clear();
type = Figure_Type(rand() % 7);
rotation = 0;
shift.dx = 0;
shift.dy = 0;
Generate();
}
您可能正在調用不確定的行為。
如果沒有更多信息,我想您是通過陳舊的對象引用/指針來調用實例方法(在回調注冊時獲取的引用不再有效嗎?)。
另外,正如問題中當前所寫,您正在基於mask
單元化字節生成圖形,因此您可能也希望對其進行初始化。
這是對oa稍作現代化/清理的版本的看法。 注意
using namespace
srand
移入main
而不是構造器 #ifndef FIGURE_H_INCLUDED
#define FIGURE_H_INCLUDED
#include <vector>
#ifdef _WIN32
# include <Windows.h>
# include "Other.h"
#else
# include <cstdint>
# include <cstdlib>
# include <ctime>
using HDC = uint32_t;
#endif
struct Cell
{
Cell(int _x=1, int _y=1): x(_x), y(_y) { }
void Draw(HDC&) const;
bool operator ==(const Cell& a) const { return (x == a.x && y == a.y); }
bool operator !=(const Cell& a) const { return !(*this == a); }
int x;
int y;
};
struct Shift
{
Shift(int dx=0, int dy=0) : dx(dx), dy(dy) {}
int dx, dy;
};
enum class Direction
{
up, down, left, right
};
enum Figure_Type { I, J, L, O, S, T, Z };
class Figure
{
public:
/* CONSTRUCTORS */
Figure();
Figure(Figure_Type);
/* MOVEMENT */
bool Move(std::vector<Cell>&, Direction&);
void Drop(std::vector<Cell>&);
bool Rotate(std::vector<Cell>&);
/* OTHER */
void Draw(HDC&);
private:
/* METHODS */
void Generate();
void GenerateMasks();
void GenerateFigure();
Figure GetFigureCopy() const;
/* DATA */
char mask[4][4];
std::vector<Cell> vCells;
Figure_Type type;
int rotation;
Shift shift;
};
#endif
/*
* And I'm getting exceptions on vCells.clear() method and (if I comment first
* line) vCells.push_back(cell) line. Actually every operation with vector /
* vector iterators crash my program even incrementing iterator, those are just
* the first so my code isn't running any longer after them.
*
* Exception text:
* **"Unhandled exception at 0x5A4ACCD2 (msvcp110d.dll) in
* Tetris_completely_new.exe: 0xC000041D: An unhandled exception was
* encountered during a user callback."**
*
* And these exceptions are thrown on 217's line of "xutility". I commented it:
*
* ....
* // MEMBER FUNCTIONS FOR _Container_base12
* inline void _Container_base12::_Orphan_all()
* { // orphan all iterators
* #if _ITERATOR_DEBUG_LEVEL == 2
* if (_Myproxy != 0)
* { // proxy allocated, drain it
* _Lockit _Lock(_LOCK_DEBUG);
*
* for (_Iterator_base12 **_Pnext = &_Myproxy->_Myfirstiter;
* *_Pnext != 0; *_Pnext = (*_Pnext)->_Mynextiter)
* **(*_Pnext)->_Myproxy = 0;** // <------------ THIS LINE
* _Myproxy->_Myfirstiter = 0;
* }
* #endif // _ITERATOR_DEBUG_LEVEL == 2
* }
* ....
*
* Here is how my **Cell struct** looks like:
*/
//And **Figure constructor**:
Figure::Figure()
: mask {{0}},
vCells(),
type((Figure_Type) (rand() % 7)),
rotation(0),
shift({0,0})
{
Generate();
}
//My constructors are using Generate() method, which code is:
void Figure::Generate()
{
GenerateFigure();
}
void Figure::GenerateFigure()
{
vCells.clear();
for(int y = 0; y < 4; y++) {
for(int x = 0; x < 4; x++) {
if(mask[y][x] == '0')
vCells.push_back({4 + x + shift.dx, 20 - y + shift.dy});
}
}
}
int main()
{
srand(time(0));
Figure fig1;
Figure fig2;
}
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