/Src/Dependencies/Boost/boost/accumulators/framework/accumulators/value_accumulator.hpp
http://hadesmem.googlecode.com/ · C++ Header · 89 lines · 56 code · 16 blank · 17 comment · 0 complexity · 2b5853786c766a2adc26442b15c4f534 MD5 · raw file
- ///////////////////////////////////////////////////////////////////////////////
- // value_accumulator.hpp
- //
- // Copyright 2005 Eric Niebler, Daniel Egloff. 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_ACCUMULATORS_FRAMEWORK_ACCUMULATORS_VALUE_ACCUMULATOR_HPP_EAN_03_23_2006
- #define BOOST_ACCUMULATORS_FRAMEWORK_ACCUMULATORS_VALUE_ACCUMULATOR_HPP_EAN_03_23_2006
- #include <boost/mpl/always.hpp>
- #include <boost/parameter/keyword.hpp>
- #include <boost/accumulators/framework/depends_on.hpp> // for feature_tag
- #include <boost/accumulators/framework/accumulator_base.hpp>
- #include <boost/accumulators/framework/extractor.hpp>
- namespace boost { namespace accumulators
- {
- namespace impl
- {
- //////////////////////////////////////////////////////////////////////////
- // value_accumulator_impl
- template<typename ValueType, typename Tag>
- struct value_accumulator_impl
- : accumulator_base
- {
- typedef ValueType result_type;
- template<typename Args>
- value_accumulator_impl(Args const &args)
- : val(args[parameter::keyword<Tag>::get()])
- {
- }
- result_type result(dont_care) const
- {
- return this->val;
- }
- private:
- ValueType val;
- };
- } // namespace impl
- namespace tag
- {
- //////////////////////////////////////////////////////////////////////////
- // value_tag
- template<typename Tag>
- struct value_tag
- {
- };
- //////////////////////////////////////////////////////////////////////////
- // value
- template<typename ValueType, typename Tag>
- struct value
- : depends_on<>
- {
- /// INTERNAL ONLY
- ///
- typedef mpl::always<accumulators::impl::value_accumulator_impl<ValueType, Tag> > impl;
- };
- }
- namespace extract
- {
- BOOST_ACCUMULATORS_DEFINE_EXTRACTOR(tag, value, (typename)(typename))
- BOOST_ACCUMULATORS_DEFINE_EXTRACTOR(tag, value_tag, (typename))
- }
- using extract::value;
- using extract::value_tag;
- // Map all value<V,T> features to value_tag<T> so
- // that values can be extracted using value_tag<T>
- // without specifying the value type.
- template<typename ValueType, typename Tag>
- struct feature_of<tag::value<ValueType, Tag> >
- : feature_of<tag::value_tag<Tag> >
- {
- };
- }} // namespace boost::accumulators
- #endif