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eval.hpp
/*============================================================================= Copyright (c) 2015 Paul Fultz II eval.h Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) ==============================================================================*/ #ifndef BOOST_HOF_GUARD_EVAL_H #define BOOST_HOF_GUARD_EVAL_H /// eval /// ==== /// /// Description /// ----------- /// /// The `eval` function will evaluate a "thunk". This can be either a nullary /// function or it can be a unary function that takes the identity function as /// the first parameter(which is helpful to delay compile-time checking). /// Also, additional parameters can be passed to `eval` to delay /// compiliation(so that result can depend on template parameters). /// /// Synopsis /// -------- /// /// template<class F, class... Ts> /// constexpr auto eval(F&& f, Ts&&...); /// /// Requirements /// ------------ /// /// F must be: /// /// * [EvaluatableFunctionObject](EvaluatableFunctionObject) /// /// Example /// ------- /// /// #include <boost/hof.hpp> /// #include <cassert> /// /// int main() { /// assert(boost::hof::eval([]{ return 3; }) == 3); /// } /// /// References /// ---------- /// /// * [POO51](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0051r2.pdf) - Proposal for C++ /// Proposal for C++ generic overload function /// * [static_if](static_if) /// * [Ordering evaluation of arguments](<Ordering evaluation of arguments>) /// #include <boost/hof/always.hpp> #include <boost/hof/identity.hpp> #include <boost/hof/first_of.hpp> #include <boost/hof/detail/result_of.hpp> namespace boost { namespace hof { namespace detail { struct simple_eval { template<class F, class... Ts> constexpr BOOST_HOF_SFINAE_RESULT(F) operator()(F&& f, Ts&&...xs) const BOOST_HOF_SFINAE_RETURNS (boost::hof::always_ref(f)(xs...)()); }; struct id_eval { template<class F, class... Ts> constexpr BOOST_HOF_SFINAE_RESULT(F, id_<decltype(boost::hof::identity)>) operator()(F&& f, Ts&&...xs) const BOOST_HOF_SFINAE_RETURNS (boost::hof::always_ref(f)(xs...)(boost::hof::identity)); }; } BOOST_HOF_DECLARE_STATIC_VAR(eval, boost::hof::first_of_adaptor<detail::simple_eval, detail::id_eval>); }} // namespace boost::hof #endif