v1.2.1

MPark.Variant is an implementation of C++17 std::variant for C++11/14/17.

The implementation is based on my implementation of std::variant for libc++ and is continuously tested against libc++'s std::variant test suite.

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Bug Fixes

• Add missing SFINAE condition for the converting constructor
• Fix an incorrect use of __has_include
• Fix a big compile-time performance issue on GCC 4.9 and 5