Fix VS 2013 build, fix clang struct/class mismatch warnings

martinmoene / optional-lite

optional lite - A C++17-like optional, a nullable object for C++98, C++11 and later in a single-file header-only library

Boost Software License 1.0

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Closed LAJW closed 7 years ago

LAJW commented 7 years ago

Fixes -Wall -Wpedantic -Werror Clang builds stopping at struct/class hash mismatch.

Fixes VS 2013 builds, as it doesn't support multiline constexpr functions.