#include <iostream> #include <cstdlib> class MyClass { public: void* operator new(std::size_t size) { std::cout << "Custom new operator called, size = " << size << std::endl; return std::malloc(size); } void operator delete(void* ptr) noexcept { std::cout << "Custom delete operator called" << std::endl; std::free(ptr); } void* operator new[](std::size_t size) { std::cout << "Custom new[] operator called, size = " << size << std::endl; return std::malloc(size); } void operator delete[](void* ptr) noexcept { std::cout << "Custom delete[] operator called" << std::endl; std::free(ptr); } // 构造函数和析构函数略 }; int main() { MyClass* p = new MyClass(); delete p; MyClass* arr = new MyClass[10]; delete[] arr; return 0; } 在这段代码中如何给delete加打印文件名称的功能

要在 delete 中添加打印文件名称的功能，可以使用宏定义的方式，在 delete 操作时调用自定义的 delete 函数。具体实现如下：

#include <iostream>
#include <cstdlib>

#define DELETE_WITH_INFO(ptr) CustomDelete(ptr, __FILE__, __LINE__)

void CustomDelete(void* ptr, const char* file, int line) noexcept {
    std::cout << "Custom delete operator called from " << file << " line " << line << std::endl;
    std::free(ptr);
}

class MyClass {
public:
    void* operator new(std::size_t size) {
        std::cout << "Custom new operator called, size = " << size << std::endl;
        return std::malloc(size);
    }

    void operator delete(void* ptr) noexcept {
        DELETE_WITH_INFO(ptr);
    }

    void* operator new[](std::size_t size) {
        std::cout << "Custom new[] operator called, size = " << size << std::endl;
        return std::malloc(size);
    }

    void operator delete[](void* ptr) noexcept {
        DELETE_WITH_INFO(ptr);
    }

    // 构造函数和析构函数略
};

int main() {
    MyClass* p = new MyClass();
    DELETE_WITH_INFO(p);

    MyClass* arr = new MyClass[10];
    DELETE_WITH_INFO(arr);

    return 0;
}

在 delete 操作时使用 DELETE_WITH_INFO 宏代替 delete 操作即可。该宏会调用 CustomDelete 函数，该函数会打印文件名称和行号，并调用 std::free() 函数释放内存。