c++ - 错误 C2360 : Initialization of 'hdc' is skipped by 'case' label

Question

下面两个定义的巨大差异在哪里，会产生错误C2360？

switch (msg) {
    case WM_PAINT:
        HDC hdc;
        hdc = BeginPaint(hWnd, &ps); // No error
        break;
}

和

switch (msg) {
    case WM_PAINT:
        HDC hdc = BeginPaint(hWnd, &ps); // Error
        break;
}

Answer 1

第一个是合法的，第二个不是。有时允许跳过没有初始化器的声明，但绝不允许有初始化器的声明。

参见 Storage allocation of local variables inside a block in c++ .