如何为std :: string对象预分配内存？ [英] how to pre-allocate memory for a std::string object?

问题描述

我需要将文件复制到字符串中。我需要某个地方为该字符串对象预先分配内存，并直接读取文件内容到该字符串的内存中。

I need to copy a file into a string. I need someway to preallocate memory for that string object and a way to directly read the file content into that string's memory?

推荐答案

code> std :: string 还有一个 .reserve 方法。

std::string also has a .reserve method.

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