重载全局operator_new制造bug

目录

• main.cpp编译后链接libA.so，如果libA.so的开发者重载了全局::operator new(size_t)
  展开查看

  
     // 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;
    }