在 C++ 中将浮点数转换为 std::string
我有一个浮点值需要放入 std::string.如何从浮点数转换为字符串?
I have a float value that needs to be put into a std::string. How do I convert from float to string?
float val = 2.5;
std::string my_val = val; // error here
推荐答案
除非你担心性能，否则使用 字符串流:
Unless you're worried about performance, use string streams:
#include <sstream>
//..
std::ostringstream ss;
ss << myFloat;
std::string s(ss.str());
如果您对 Boost 没问题，lexical_cast<> 是一个方便的选择:
If you're okay with Boost, lexical_cast<> is a convenient alternative:
std::string s = boost::lexical_cast<std::string>(myFloat);
有效的替代品是例如FastFormat 或简单的 C 风格函数.
Efficient alternatives are e.g. FastFormat or simply the C-style functions.
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