如何将初始化列表作为函数参数传递? [英] How to pass an initializer list as a function argument?

问题描述

基本上，我想做这样的事情:

Basically, I'm looking to do something like this:

HANDLE hThread1 = CreateThread(...);
HANDLE hThread2 = CreateThread(...);
HANDLE hThread3 = CreateThread(...);

...

WaitForMultipleObjects( 3, {hThread1,hThread2,hThread3}, FALSE, INFINITE );

代替此:

HANDLE hThread[3];
hThread[0] = CreateThread(...);
hThread[1] = CreateThread(...);
hThread[2] = CreateThread(...);

...

WaitForMultipleObjects( 3, hThread, FALSE, INFINITE );

我发现的唯一解决方案是使用 std :: initializer_list ，但是显然 WaitForMultipleObjects()不接受 std ::initializer_list

The only solution I've found is using std::initializer_list, but obviously WaitForMultipleObjects() doesn't doesn't accept an std::initializer_list

推荐答案

然后编写一个包装器.

DWORD wait_for_multiple_objects(
    std::initializer_list<HANDLE> handles,
    bool wait_all = false, DWORD time = INFINITE
) {
    return WaitForMultipleObjects(
        handles.size(), &*handles.begin(), wait_all, time
    );
}

现在您可以这样做:

wait_for_multiple_objects({ handle1, handle2, handle3 });

这显然需要支持 initializer_list 的C ++ 11编译器.如果您希望传递已经存在的参数，则 std :: vector< HANDLE> 可能是该参数的更好类型.或更通用的迭代器/范围接口，但这留给读者练习.

This obviously requires C++11 compiler that supports initializer_list. std::vector<HANDLE> might be a better type for the argument if you expect to pass an already-existing one. Or a more generic iterator/range interface, but that's left as an exercise for the reader.

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