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Git@OSC 项目推荐 —— 增强版 Boost.Variant

Some C++ utilities

function_traits include arity, result_type and arg<N>, also defined arguments_tuple that contains all argument types
make_function creates std::function wrapper that matches the original function signature
make_function_type<F> is the correspoding type for std::function wrapper
variant Similiar to Boost.Variant, with full move and rvalue-reference support, less hacks, i.e. avoid using of boost::detail::variant::void_ to fulfill all template arguments.