char* AllocateString( unsigned int nSize )
{
nSize;// just make compiler happy
return NULL;
}
没分配任何内存？

...
void ReleaseAllocator()
{
//...
}
释放却实实在在释放一些东西，收尾？
...
typedef char* ( *New )( unsigned int );
typedef void ( *Release )();
struct StringAllocator
{
New allocate;
Release release;
};
只有2个函数的结构

...
struct StringAllocator theAllocator;
theAllocator.allocate = AllocateString;
theAllocator.release = ReleaseAllocator;
atexit( theAllocator.release );

theAllocator到底能作什么事情？
关程序时才theAllocator.release ？