连接普通字符和字符串?

问题描述

我被这个看似简单的问题完全搞糊涂了.

im getting totally confused by this seemingly simple problem.

我有一个痛苦的旧字符，我想将它连接到一个字符串的中间.像这样.

I have a pain old char, and I want to concatenate it in the middle of a string. Like so.

string missingOptionArg(char missingArg) {
     return "Option -" + missingArg + " requires an operand";
}

我猜 + 操作数足够聪明，可以处理这种琐碎的事情，如果不是，那么最简单的方法是什么?

I was guessing the + operand was smart enough to deal with this sort of trivial thing, if not, what would be the simplest way of doing this?

推荐答案

连接字符串字面量和字符:

To concatenate string literal and char:

std::string miString = std::string("something") + c;

当您需要连接两个字符串字面量时，也会发生类似的情况.

A similar thing happens when you need to concat two strings literals.

注意 "something" 不是 std::string，它是一个指向字符数组的指针.然后你不能使用 + 连接两个字符串文字，那将添加两个指针并且不是你想要的.

Note that "something" is not a std::string, it is a pointer to an array of chars. Then you can't concatenate two string literals using +, that would be adding two pointers and is not what you want.

您的代码的更正在 Igor 的评论中.

The correction of your code is in Igor's comment.

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