小编AM *_*M Z的帖子

#include <iostream>
#include <string>

void* operator new(size_t size) {
    std::cout << "Allocated: " << size << " Bytes\n";
    return malloc(size);
}

void operator delete(void* var) {
    std::cout << "Deleted\n";
    free(var);
}

int main() {
    std::string name0 = "Ahmed Zaki Marei";
    //std::string name1 = "Lara Mohammed";

    std::cout << name0 << "\n";
    //std::cout << name1 << "\n";
}

当我尝试运行此代码时，它给了我以下输出：

Allocated: 8 Bytes
Allocated: 32 Bytes
Ahmed Zaki Marei
Deleted
Deleted

为什么它先分配 8 个字节然后分配 32 个字节？有谁能解释一下吗？谢谢！:)

#include <iostream>

#define print(x) std::cout << x
#define println(x) std::cout << x << std::endl

struct Vector2 {
    float x, y;
};

struct Vector4 {
    union {
        struct {
            float x, y, z, w;
        };
        struct {
            Vector2 a, b;
        };
    };
};

void PrintVector2(const Vector2& vector) {
    println(vector.x << ", " << vector.y);
}

int main() {
    Vector4 vector = { 1, 2, 3, 4 };
    vector.x = 2;
    vector.z = 500.0f;
    PrintVector2(vector.a);
    PrintVector2(vector.b);
}

谁能解释一下这段代码发生了什么？，我不明白工会是什么以及它们是如何工作的：/！

这是输出

2, 2
500, …