自定义重载New和Delete运算符

#include <iostream>
#include <cstdlib>

class MyClass {
public:
    // 自定义 new 运算符
    void* operator new(size_t size) {
        std::cout << "Custom new called, size: " << size << std::endl;
        void* ptr = malloc(size);
        if (!ptr) throw std::bad_alloc();
        return ptr;
    }

    // 自定义 delete 运算符
    void operator delete(void* ptr) noexcept {
        std::cout << "Custom delete called" << std::endl;
        free(ptr);
    }
};

int main() {
    MyClass* obj = new MyClass(); // 调用自定义的 new
    delete obj;                   // 调用自定义的 delete
    return 0;
}

void* operator new(size_t size) {
    void* ptr = malloc(size);
    if (!ptr) throw std::bad_alloc();
    return ptr;
}

int main() {
    try {
        MyClass* obj = new MyClass();
        delete obj;
    } catch (const std::bad_alloc& e) {
        std::cerr << "Memory allocation failed: " << e.what() << std::endl;
    }
    return 0;
}