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128 lines
2.5 KiB
C++
128 lines
2.5 KiB
C++
/*<-
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Copyright Barrett Adair 2016
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http ://boost.org/LICENSE_1_0.txt)
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->*/
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#include <boost/callable_traits/config.hpp>
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#ifdef CALLABLE_TRAITS_DISABLE_ABOMINABLE_FUNCTIONS
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int main(){}
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#else
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//[ overview
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#include <boost/callable_traits.hpp>
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#include <type_traits>
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#include <tuple>
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using std::is_same;
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using std::tuple;
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using namespace boost::callable_traits;
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struct number {
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int value;
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auto add(int n) const { return value + n; }
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};
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using pmf = decltype(&number::add);
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//` Manipulate member functions pointers with ease:
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static_assert(is_same<
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remove_member_const_t<pmf>,
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int(number::*)(int)
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>{}, "");
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static_assert(is_same<
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add_member_volatile_t<pmf>,
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int(number::*)(int) const volatile
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>{}, "");
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static_assert(is_same<
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parent_class_of_t<pmf>,
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number
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>{}, "");
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//` INVOKE-aware metafunctions:
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static_assert(is_same<
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args_t<pmf>,
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tuple<const number&, int>
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>{}, "");
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static_assert(is_same<
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arg_at_t<0, pmf>,
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const number&
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>{}, "");
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static_assert(is_same<
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arg_at_t<1, pmf>,
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int
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>{}, "");
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static_assert(is_same<
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return_type_t<pmf>,
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int
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>{}, "");
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static_assert(is_same<
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function_type_t<pmf>,
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int(const number&, int)
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>{}, "");
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static_assert(is_same<
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qualified_parent_class_of_t<pmf>,
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const number&
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>{}, "");
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//` Here are a few other trait examples:
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static_assert(is_const_member<pmf>{}, "");
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static_assert(!is_volatile_member<pmf>{}, "");
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static_assert(!has_void_return<pmf>{}, "");
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static_assert(!has_varargs<pmf>{}, "");
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//` You can use [libname] to manipulate parameter lists (not defined in terms of INVOKE, since that wouldn't make sense here):
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using pmf_2 = push_back_args_t<pmf, char, short, long>;
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static_assert(is_same<
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pmf_2,
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int(number::*)(int, char, short, long) const
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>{}, "");
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static_assert(is_same<
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pop_front_args_t<pmf_2>,
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int(number::*)(char, short, long) const
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>{}, "");
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static_assert(is_same<
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insert_args_t<2, pmf_2, short*, long*>,
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int(number::*)(int, char, short*, long*, short, long) const
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>{}, "");
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static_assert(is_same<
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replace_args_t<2, pmf_2, short*, long*>,
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int(number::*)(int, char, short*, long*) const
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>{}, "");
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static_assert(is_same<
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remove_args_t<2, pmf_2>,
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int(number::*)(int, char, long) const
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>{}, "");
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static_assert(is_same<
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clear_args_t<pmf_2>,
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int(number::*)() const
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>{}, "");
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static_assert(is_same<
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add_varargs_t<pmf_2>,
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int(number::*)(int, char, short, long, ...) const
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>{}, "");
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//]
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int main() {}
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#endif
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