Add CMakeLists.txt for example subdirectory.

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 viettrungluu closed 5 years ago

viettrungluu commented 5 years ago

This makes the OPTIONAL_LITE_OPT_BUILD_EXAMPLES option work.