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Diffstat (limited to '3rdParty/Boost/src/boost/spirit/home/phoenix/scope/let.hpp')
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1 files changed, 145 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/spirit/home/phoenix/scope/let.hpp b/3rdParty/Boost/src/boost/spirit/home/phoenix/scope/let.hpp new file mode 100644 index 0000000..40e951a --- /dev/null +++ b/3rdParty/Boost/src/boost/spirit/home/phoenix/scope/let.hpp @@ -0,0 +1,145 @@ +/*============================================================================= + Copyright (c) 2001-2007 Joel de Guzman + Copyright (c) 2004 Daniel Wallin + + 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 PHOENIX_SCOPE_LET_HPP +#define PHOENIX_SCOPE_LET_HPP + +#include <boost/spirit/home/phoenix/core/limits.hpp> +#include <boost/spirit/home/phoenix/core/composite.hpp> +#include <boost/spirit/home/phoenix/scope/scoped_environment.hpp> +#include <boost/spirit/home/phoenix/scope/detail/local_variable.hpp> +#include <boost/spirit/home/phoenix/detail/local_reference.hpp> +#include <boost/spirit/home/phoenix/core/actor.hpp> +#include <boost/fusion/include/transform.hpp> +#include <boost/fusion/include/as_vector.hpp> +#include <boost/mpl/eval_if.hpp> +#include <boost/mpl/bool.hpp> + +namespace boost { namespace phoenix +{ + template <typename Base, typename Vars, typename Map> + struct let_actor : Base + { + typedef typename + mpl::fold< + Vars + , mpl::false_ + , detail::compute_no_nullary + >::type + no_nullary; + + template <typename Env> + struct result + { + typedef typename + fusion::result_of::as_vector< + typename fusion::result_of::transform< + Vars + , detail::initialize_local<Env> + >::type + >::type + locals_type; + + typedef typename Base::template + result<scoped_environment<Env, Env, locals_type, Map> >::type + result_type; + + typedef typename + detail::unwrap_local_reference<result_type>::type + type; + }; + + let_actor(Base const& base, Vars const& vars) + : Base(base), vars(vars) {} + + template <typename Env> + typename result<Env>::type + eval(Env const& env) const + { + typedef typename + fusion::result_of::as_vector< + typename fusion::result_of::transform< + Vars + , detail::initialize_local<Env> + >::type + >::type + locals_type; + + locals_type locals = + fusion::as_vector( + fusion::transform( + vars + , detail::initialize_local<Env>(env))); + + typedef typename result<Env>::type RT; + return RT(Base::eval( + scoped_environment<Env, Env, locals_type, Map>( + env + , env + , locals))); + } + + Vars vars; + }; + + template <typename Vars, typename Map> + struct let_actor_gen + { + template <typename Base> + actor<let_actor<Base, Vars, Map> > const + operator[](actor<Base> const& base) const + { + return let_actor<Base, Vars, Map>(base, vars); + } + + let_actor_gen(Vars const& vars) + : vars(vars) {} + + Vars vars; + }; + + template <typename Key> + struct local_variable; // forward + struct assign_eval; // forward + + struct let_gen + { + template <typename K0, typename V0> + let_actor_gen< + fusion::vector<V0> + , detail::map_local_index_to_tuple<K0> + > + operator()( + actor<composite<assign_eval, fusion::vector<local_variable<K0>, V0> > > const& a0 + ) const + { + return fusion::vector<V0>(fusion::at_c<1>(a0)); + } + + template <typename K0, typename K1, typename V0, typename V1> + let_actor_gen< + fusion::vector<V0, V1> + , detail::map_local_index_to_tuple<K0, K1> + > + operator()( + actor<composite<assign_eval, fusion::vector<local_variable<K0>, V0> > > const& a0 + , actor<composite<assign_eval, fusion::vector<local_variable<K1>, V1> > > const& a1 + ) const + { + return fusion::vector<V0, V1>(fusion::at_c<1>(a0), fusion::at_c<1>(a1)); + } + + // Bring in the rest... + #define PHOENIX_LOCAL_GEN_NAME let_actor_gen + #include <boost/spirit/home/phoenix/scope/detail/local_gen.hpp> + #undef PHOENIX_LOCAL_GEN_NAME + }; + + let_gen const let = let_gen(); +}} + +#endif |