To use:

1. Include boost-fallback.cmake in your project
2. If desired, use the provided header file to switch between the various implementations:

include(boost-fallback/boost-fallback.cmake)

set(NAMESPACE_ALIAS some_namespace)
configure_file(boost-fallback/boost-std-configuration.h.cmake
    boost-fallback/boost-std-configuration.h)
target_include_directories( executable-name PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/boost-fallback )

Fallback looks for the following C++11 features:

• std::thread / boost::thread
• std::mutex / boost::mutex (and the locks for these structures)
• std::shared_ptr / boost::shared_ptr
• std::atomic / boost::atomic

The following C++17 features are looked for:

• std::shared_mutex / boost::shared_mutex