variant2/README.md

variant2

A never-valueless C++14 implementation of std::variant. Requires mp11 and Boost.Config. Intended to be placed into the libs/variant2 directory of a Boost clone or release, with mp11 in libs/mp11.

To avoid the valueless state, this implementation falls back to using double storage unless

• all the contained types are nothrow move constructible, or
• at least one contained type has a nothrow default constructor.

Supported compilers:

• g++ 5 or later with -std=c++14 or -std=c++1z
• clang++ 3.5 or later with -std=c++14 or -std=c++1z
• Visual Studio 2017