C ++创建文本字符串和变量 [英] C++ create string of text and variables

问题描述

我正在尝试做一些非常简单的事情，但是，经过一个小时的搜索，我找不到合适的答案，所以我肯定错过了一些显而易见的事情。

I'm trying to do something very simple and yet, after an hour of so of searching a I can't find a suitable answer so I must be missing something fairly obvious.

我正在尝试动态创建用于ifstream的文件名。虽然我了解可以使用多种方法来执行此操作，但是我已经决定创建std :: string，并使用stringname.c_str转换为const。

I'm trying to dynamically create filenames for use with ifstream. Whilst I understand various methods are available of doing this, I have settled on creating a std::string, and the using stringname.c_str to convert to const.

问题但是，我需要使用变量和预定义的文本值的组合来创建字符串。我遇到编译器错误，因此这肯定是语法问题。

The problem is however that I need to create the string with a mix of variables and predefined text values. I'm getting compiler errors, so this must be a syntax issue.

伪

std::string var = "sometext" + somevar + "sometext" + somevar;

谢谢！

推荐答案

您是否考虑过使用字符串流？

Have you considered using stringstreams?

#include <string>
#include <sstream>

std::ostringstream oss;
oss << "sometext" << somevar << "sometext" << somevar;
std::string var = oss.str();

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