There are two ways to convert any fundamental data to string. std::to_string std::ostringstream boost::lexical_cast In this post, I will analyze which one is the fastest to convert any fundamental data to string. I am using google to measure the time difference. In all charts, y-axis is time in nano seconds and x-axis is both real time and cpu time. benchmark type=int input_count = 1 For only, one , both std::stringstream and std::ostringstream take nearly same time. boost::lexical_cast in the fastest. And std::to_string is in between. conversion 2. type=int input_count > 30 Here both std::stringstream and std::ostringstream outperform std::to_string and boost::lexical_cast. You can get better result by reusing std::stringstream and std::ostringstream buffer. ```cpp std::ostringstream oss; oss.str(“”); oss.clear(); ``` Creating stream objects are very expensive. So, reuse of buffer gives better result. 3. type=double input_count=1 Performance is very similar to integer. Boost lexical_cast outperforms everyone. 3. type=double input_count=30 For multiple inputs, boost::lexical_cast outperforms everyone else. So, my observations are Always use std::to_string to convert any single value to std::string. In case of double, use std::string. If you need, precision, use std::ostringstream. In all other cases, use std::ostringstream. Prefer boost::lexical_cast if you have boost in your project Image produced: https://github.com/asit-dhal/BenchmarkViewer

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std::string conversion benchmark in C++

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