重载全局operator_new制造bug

   // A.cpp的重载了全局::operator new(size_t)代码如下
   // 使用  g++ -shared -fPIC -o libA.so A.cpp编译
   void * operator new ( size_t len ) throw ( std::bad_alloc )
   {
      printf("operator new in shared library\n");
      void * mem = malloc( len );
      if ( (mem == 0) && (len != 0) ) throw std::bad_alloc();
      return mem;
   }
   void * operator new[] ( size_t len ) throw ( std::bad_alloc )
   {
      printf("operator new[] in shared library\n");
      void * mem = malloc( len );
      if ( (mem == 0) && (len != 0) ) throw std::bad_alloc();
      return mem;
   }
   void operator delete ( void * ptr ) throw()
   {
      printf("operator delete in shared library\n");
      if ( ptr != 0 ) free ( ptr );
   }
   void operator delete[] ( void * ptr ) throw()
   {
      printf("operator delete[] in shared library\n");
      if ( ptr != 0 ) free ( ptr );
   }

  // main.cpp代码如下
  // 编译 : g++ -o main main.cpp -L./ -lA -Wl,-rpath,./ 其中指定了rpath为当前目录
  int main() {
      int* p = new int{5}; // 调用了 A.cpp 中定义的全局 operator new
      delete p; // 调用了 A.cpp 中定义的全局 operator delete
      return 0;
  }