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      2. 为什么没有 std::copy_if 算法?

        时间:2024-05-11
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                  问题描述

                  在 C++ 中没有 std::copy_if 算法有什么具体原因吗?我知道我可以使用 std::remove_copy_if 来实现所需的行为.我认为它是在 C++0x 中出现的,但是一个简单的 copy_if 需要一个范围、一个输出迭代器和一个函子会很好.它只是简单地错过了还是背后有其他原因?

                  Is there any specific reason for not having std::copy_if algorithm in C++ ? I know I can use std::remove_copy_if to achieve the required behavior. I think it is coming in C++0x, but a simple copy_if which takes a range, a output iterator and a functor would have been nice. Was it just simply missed out or is there some other reason behind it?

                  推荐答案

                  根据 Stroustrup 的C++ 编程语言",这只是一个疏忽.

                  According to Stroustrup's "The C++ Programming Language" it was just an over-sight.

                  (作为引文,在 boost 邮件列表中回答了同样的问题:copy_if)

                  (as a citation, the same question answered in boost mail-lists: copy_if)

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