使用范围库初始化std :: vector [英] Initializing std::vector with ranges library
问题描述
我想用一系列连续的整数初始化 std :: vector
而不键入所有的整数,例如第二行,它不会编译此代码段:
I would like to initialize std::vector
with a range of consecutive integers without typing all of them, something like a second line, which doesn't compile, in this code snippet:
std::vector<int> a{0, 1, 2, 3, 4, 5};
std::vector<int> b{std::ranges::iota_view(0, 5)}; // ERROR!
当然,我会更喜欢:
std::vector<int> b{0:5};
,但这不是C ++ 41标准之前的时间。有任何想法如何在C ++ 20中实现吗?
but this is not scheduled before C++41 standard. Any ideas how to do it in C++20?
推荐答案
您正在寻找的是
auto b=std::ranges::to<std::vector>(std::ranges::iota_view(0, 5));
不幸的是,提案错过了C ++ 20,仅仅是因为没有时间审查其措辞(在之前的版本中添加了您尝试过的构造函数不可行)。希望它将在C ++ 23周期的早期合并并实现。
Unfortunately, that proposal missed C++20 simply because there wasn’t time to review its wording (after a previous version that added the constructor you tried was found unworkable). Hopefully it’ll be merged—and implemented—early in the C++23 cycle.
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