python/detail/dependent.hpp

0001 // Copyright David Abrahams 2002.
0002 // Distributed under the Boost Software License, Version 1.0. (See
0003 // accompanying file LICENSE_1_0.txt or copy at
0004 // http://www.boost.org/LICENSE_1_0.txt)
0005 #ifndef DEPENDENT_DWA200286_HPP
0006 # define DEPENDENT_DWA200286_HPP
0007
0008 namespace boost { namespace python { namespace detail {
0009
0010 // A way to turn a concrete type T into a type dependent on U. This
0011 // keeps conforming compilers (those implementing proper 2-phase
0012 // name lookup for templates) from complaining about incomplete
0013 // types in situations where it would otherwise be inconvenient or
0014 // impossible to re-order code so that all types are defined in time.
0015
0016 // One such use is when we must return an incomplete T from a member
0017 // function template (which must be defined in the class body to
0018 // keep MSVC happy).
0019 template <class T, class U>
0020 struct dependent
0021 {
0022     typedef T type;
0023 };
0024
0025 }}} // namespace boost::python::detail
0026
0027 #endif // DEPENDENT_DWA200286_HPP