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Diffstat (limited to '3rdParty/Boost/src/boost/parameter/aux_/default.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/parameter/aux_/default.hpp | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/parameter/aux_/default.hpp b/3rdParty/Boost/src/boost/parameter/aux_/default.hpp new file mode 100644 index 0000000..604da61 --- /dev/null +++ b/3rdParty/Boost/src/boost/parameter/aux_/default.hpp @@ -0,0 +1,69 @@ +// Copyright Daniel Wallin, David Abrahams 2005. Use, modification and +// distribution is subject to 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 DEFAULT_050329_HPP +# define DEFAULT_050329_HPP + +# include <boost/detail/workaround.hpp> + +namespace boost { namespace parameter { namespace aux { + +// A wrapper for the default value passed by the user when resolving +// the value of the parameter with the given Keyword +template <class Keyword, class Value> +struct default_ +{ + default_(Value& x) + : value(x) + {} + + Value& value; +}; + +// +// lazy_default -- +// +// A wrapper for the default value computation function passed by +// the user when resolving the value of the parameter with the +// given keyword +// +# if BOOST_WORKAROUND(__EDG_VERSION__, <= 300) +// These compilers need a little extra help with overload +// resolution; we have empty_arg_list's operator[] accept a base +// class to make that overload less preferable. +template <class KW, class DefaultComputer> +struct lazy_default_base +{ + lazy_default_base(DefaultComputer const& x) + : compute_default(x) + {} + DefaultComputer const& compute_default; +}; + +template <class KW, class DefaultComputer> +struct lazy_default + : lazy_default_base<KW,DefaultComputer> + { + lazy_default(DefaultComputer const & x) + : lazy_default_base<KW,DefaultComputer>(x) + {} + }; +# define BOOST_PARAMETER_lazy_default_fallback lazy_default_base +# else +template <class KW, class DefaultComputer> +struct lazy_default +{ + lazy_default(const DefaultComputer& x) + : compute_default(x) + {} + DefaultComputer const& compute_default; +}; +# define BOOST_PARAMETER_lazy_default_fallback lazy_default +# endif + +}}} // namespace boost::parameter::aux + +#endif // DEFAULT_050329_HPP + |