如何高效复制istringstream？

发布于 2024-08-05 14:22:41 字数 133 浏览 2 评论 0原文

还是奥斯特流？

istringstream a("asd");
istringstream b = a; // This does not work.

我想 memcpy 也不起作用。

原文

Or ostringstream?

istringstream a("asd");
istringstream b = a; // This does not work.

I guess memcpy won't work either.

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篱下浅笙歌 2024-08-12 14:22:41

istringstream a("asd");
istringstream b(a.str());

编辑：
根据您对其他回复的评论，听起来您可能还想将 fstream 的全部内容复制到 strinstream 中。你也不想/必须一次只做一个角色（你是对的——这通常很慢）。

// create fstream to read from
std::ifstream input("whatever");

// create stringstream to read the data into
std::istringstream buffer;

// read the whole fstream into the stringstream:
buffer << input.rdbuf();

istringstream a("asd");
istringstream b(a.str());

Edit:
Based on your comment to the other reply, it sounds like you may also want to copy the entire contents of an fstream into a strinstream. You don't want/have to do that one character at a time either (and you're right -- that usually is pretty slow).

// create fstream to read from
std::ifstream input("whatever");

// create stringstream to read the data into
std::istringstream buffer;

// read the whole fstream into the stringstream:
buffer << input.rdbuf();

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多像笑话 2024-08-12 14:22:41

您不能只复制流，还必须使用迭代器复制它们的缓冲区。例如：

#include <sstream>
#include <algorithm>
......
std::stringstream first, second;
.....
std::istreambuf_iterator<char> begf(first), endf;
std::ostreambuf_iterator<char> begs(second);
std::copy(begf, endf, begs);

You can't just copy streams, you have to copy their buffers using iterators. For example:

#include <sstream>
#include <algorithm>
......
std::stringstream first, second;
.....
std::istreambuf_iterator<char> begf(first), endf;
std::ostreambuf_iterator<char> begs(second);
std::copy(begf, endf, begs);

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