[dtho]

The constructor of std::string is constexpr in C++20. A runtime call to 'strlen' (or equivalent) can be optimized out by computing the string's length at compile time and initializing the object accordingly.

[rewmie]

> The constructor of std::string is constexpr in C++20.

If I recall correctly, from C++20 onward all member functions of std::string are constexpr.