C ++字符替换 [英] C++ character replace

问题描述

什么是一个字符串替换字符的最佳方式？

What is the best way to replace characters in a string?

具体做法是：

"This,Is A|Test" ----> "This_Is_A_Test"

我要全部更换逗号，空格和|用下划线。

I want to replace all commas, spaces, and "|" with underscores.

（我有机会获得提振。）

(I have access to Boost.)

推荐答案

至于其他的答案表明，你可以使用各种替换方法。然而，这些方法有字符串多次（一次每个字符）扫描的缺点。我会建议滚动您自己更换方法，如果你在乎速度：

As the other answers indicated, you can use the various replace methods. However, these approaches have the downside of scanning the string multiple times (one time for each character). I would recommend rolling your own replace method, if you care about speed:

void beautify(std::string &s) {
    int i;
    for (i = 0; i < s.length(); ++i) {
        switch (s[i]) {
        case ' ':
        case ',':
        case '|':
            s[i] = '_';
        }
    }
}

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