This is a tiny, header-only library that implements to_static_string: a C++17 drop-in replacement for std::to_string, based on std::to_chars.

For instance:

#include "tostr/to_static_string.h" #include <iostream> int main() { // We have an integer value to convert to string int value = 42; // Converting it returns a cstatic_string<N>, a stack-based // string holding the result of the conversion. N is selected // at compile-time, depending on the type auto str = tostr::to_static_string(value); // We can use .get() to retrieve a std::string_view for that buffer std::cout << "The answer is: " << str.get() << std::endl; } 

When compared to std::to_string, it has the following advantages:

• It is faster. See the benchmark section (TODO: link) below.
• It is non-allocating. All operations use stack memory.
• It is non-throwing. It is guaranteed that to_static_string will never throw exceptions.
• It is locale-independant. This is specially important for floating-point values, where the decimal point can be affected by locale configuration.

When compared to just using std::to_chars:

• It is a level of abstraction above. This means it is safer, since you do not need to think of buffer size - we do it for you.
• It has comparable performance (see below).

These benchmarks have been obtained under an i7-10510U CPU @ 1.80GHz, using clang-18, under CMake Release variant, using libstdc++ (Ubuntu 22.04) and C++20.

Testing is still an ongoing effort. It has only been tested locally with the compiler/setup mentioned above.