mpl11/fwd_2maybe_8hpp_source.html

 #ifndef BOOST_MPL11_FWD_MAYBE_HPP

 #define BOOST_MPL11_FWD_MAYBE_HPP


 #include <boost/mpl11/detail/config.hpp>

 #include <boost/mpl11/fwd/bool.hpp>

 #include <boost/mpl11/fwd/functional.hpp>


 namespace boost { namespace mpl11 {

     struct Maybe;


     template <typename x>

     struct just;


     struct nothing BOOST_MPL11_IF_DOXYGEN({ });


     template <typename def, typename f, typename m>

     struct maybe;


     template <typename m>

     BOOST_MPL11_DOXYGEN_ALIAS(is_just, maybe<false_, always<true_>, m>);


     template <typename m>

     BOOST_MPL11_DOXYGEN_ALIAS(is_nothing, maybe<true_, always<false_>, m>);


     template <typename def, typename m>

     BOOST_MPL11_DOXYGEN_ALIAS(from_maybe, maybe<def, lift<id>, m>);


     namespace maybe_detail { template <typename ...> struct err_from_just; }


     template <typename m>

     BOOST_MPL11_DOXYGEN_ALIAS(from_just,

         maybe<maybe_detail::err_from_just<>, lift<id>, m>);

 }} // end namespace boost::mpl11


 #endif // !BOOST_MPL11_FWD_MAYBE_HPP

boost::mpl11::nothing
Creates an empty optional value.
Definition: maybe.hpp:47

functional.hpp
Forward declares the Functional module.

boost::mpl11::is_nothing
Returns whether a Maybe is a nothing.
Definition: maybe.hpp:66

boost::mpl11::lift
Lifts a metafunction.
Definition: functional.hpp:155

bool.hpp
Forwards to boost/mpl11/fwd/integer.hpp.

config.hpp
Manages configurable options of the library and defines utility macros.

boost::mpl11::is_just
Returns whether a Maybe is a just.
Definition: maybe.hpp:62

boost::mpl11::just
Creates an optional value containing x.
Definition: maybe.hpp:44

boost::mpl11::maybe
Applies a metafunction class to a Maybe, with a fallback result.
Definition: maybe.hpp:58

boost::mpl11::always
Returns a constant metafunction class returning x regardless of the arguments it is invoked with...
Definition: functional.hpp:28

boost::mpl11::from_just
Extracts the value out of a just, and triggers a hard compile-time error if the argument is nothing...
Definition: maybe.hpp:84

BOOST_MPL11_IF_DOXYGEN
#define BOOST_MPL11_IF_DOXYGEN(...)
Macro expanding to its argument(s) when generating the documentation with Doxygen and to nothing othe...
Definition: config.hpp:45

boost::mpl11::from_maybe
If m is nothing, returns def.
Definition: maybe.hpp:71

BOOST_MPL11_DOXYGEN_ALIAS
#define BOOST_MPL11_DOXYGEN_ALIAS(NAME,...)
Macro expanding to a struct when generating the documentation and to an alias otherwise.
Definition: config.hpp:56

boost::mpl11::false_
Alias to bool_; provided for convenience.
Definition: integer.hpp:82

boost::mpl11::true_
Alias to bool_; provided for convenience.
Definition: integer.hpp:79