如何在 C++ 中将数组中的所有元素初始化为相同的数字

2022-01-23 00:00:00 arrays g++ c++

我正在尝试初始化一个 int 数组,并将所有内容都设置为 -1.

I'm trying to initialize an int array with everything set at -1.

我尝试了以下方法,但它不起作用.它只将第一个值设置为 -1.

I tried the following, but it doesn't work. It only sets the first value at -1.

int directory[100] = {-1};

为什么它不能正常工作?

Why doesn't it work right?

推荐答案

我很惊讶所有建议 vector 的答案.它们甚至不是一回事!

I'm surprised at all the answers suggesting vector. They aren't even the same thing!

使用 std::fill,来自<算法>:

int directory[100];
std::fill(directory, directory + 100, -1);

<小时>

不直接关心这个问题,但是当涉及到数组时,您可能需要一个不错的辅助函数:


Not concerned with the question directly, but you might want a nice helper function when it comes to arrays:

template <typename T, size_t N>
T* end(T (&pX)[N])
{
    return pX + N;
}

给予:

int directory[100];
std::fill(directory, end(directory), -1);

所以你不需要列出两次大小.

So you don't need to list the size twice.

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