创建具有指定字符数的字符串 [英] Create string with specified number of characters

问题描述

有没有一种方法可以在用c ++初始化时创建一个说256个字符的字符串?

Is there a way to create a string of say 256 characters at initialization with c++?

我的部分作业要求我"1.创建一个256个字符的字符串.使用您的名字的重复."

Part of my assignment requires me to "1. Create a string of 256 characters. Use repetitions of your first name."

除了使用循环外，我不太确定该如何做，但是我觉得有一种更简单的方法.

I'm not quite sure of how to do this other than using a loop but I feel like there is an easier way.

推荐答案

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Taking a look at the constructor reference of basic_string, one can see that there is no easy way of repeating a complete string. For a single character, you could use (2) like this:

std::string s(5, 'a'); // s == "aaaaa"

要生成字符串重复，您需要一些解决方法.只需使用例如 std :: generate (对算法很有趣)填充字符串，就可以更轻松地完成此后构造.

For generating a string repetition, you'll need some workaround. It's easier to do this post-construction by simply filling the string with, for example, std::generate (having fun with algorithms).

#include <string>
#include <algorithm>

// ...

std::string pattern("Xeo ");
auto pattern_it = pattern.begin();
std::string s(256, '\0');
std::generate(s.begin(), s.end(),
    [&]() -> char { 
      if(pattern_it == pattern.end())
        pattern_it = pattern.begin();
      return *pattern_it++; // return current value and increment
    });

实时示例.

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