分配数组时运算符new的问题 [英] problems with operator new when allocating arrays

问题描述

在某些程序代码中，像这样（它是一个构造函数）：

  MyObject（MyMesh * m，MyTexture * t，float * c = NULL，float * sr = NULL，int sh = 100）{
 texture = t; 
 mesh = m; 
 subObjects = NULL; 
 texCoords = NULL; 
 if（texture！= NULL）{
 texCoords = new float [mesh-> numSurfacePoints * 2]; 
  

new会抛出一个std :: bad_alloc异常。它在另一个地方是一样的。
是可能的，我耗尽了内存？我不这么认为，所以如果你能帮助我，我会很高兴！
bye！

解决方案

/ p>

当 std :: bad_alloc 被抛出时，程序使用多少内存？

当它崩溃时， mesh-> numSurfacePoints 的值是多少？你是否确定传入的指针是 mesh 是一个有效的指针？如果您有一个非常碎片的地址空间，可能没有足够的连续空间来分配大型数组。您的程序在 std :: bad_alloc 之前运行多长时间？

如果还没有，应该考虑使用 boost :: scoped_array 或其他形式的数组智能指针，以便在不再需要堆分配的对象时自动删除。

I'm having prblems with my C++/openGL program.

at some point of code, like these(it's a constructor):

MyObject(MyMesh * m, MyTexture* t, float *c=NULL, float *sr=NULL, int sh=100){
texture=t;
mesh=m;
subObjects=NULL;
texCoords=NULL;
if (texture!=NULL){
		texCoords=new float[mesh->numSurfacePoints*2];

the new throws an std::bad_alloc exception. it's the same at another place. is it possible, that i ran out of memory? i dont think so, so if you could help me, i would be glad! bye!

解决方案

is it possible, that i ran out of memory?

How much memory is your program using when std::bad_alloc is thrown?

What is the value of mesh->numSurfacePoints when it crashes? Are you absolutely sure that the pointer passed in as mesh is a valid pointer? If you have a very fragmented address space, there might not be enough contiguous space to allocate a large array. How long does your program run before std::bad_alloc is thrown?

If you aren't already, you should consider using boost::scoped_array or some other form of smart pointer for arrays so that deletion occurs automatically when heap-allocated objects are no longer needed.

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