result_of_example.cpp

来自「Boost provides free peer-reviewed portab」· C++ 代码 · 共 60 行

// (C) Copyright Douglas Gregor 2003-2004.
// (C) Copyright Tobias Schwinger
//
// Use modification and distribution are subject to the boost Software License,
// Version 1.0. (See http://www.boost.org/LICENSE_1_0.txt).

//------------------------------------------------------------------------------
// This file is a modified copy of the original Boost.ResultOf test-suite.
// See result_of.hpp in this directory for details.


#include "result_of.hpp"

#include <utility>
#include <boost/static_assert.hpp>
#include <boost/type_traits/is_same.hpp>

struct int_result_type { typedef int result_type; };

struct int_result_of
{
  template<typename F> struct result { typedef int type; };
};

struct int_result_type_and_float_result_of
{
  typedef int result_type;
  template<typename F> struct result { typedef float type; };
};

struct X {};

int main()
{
  using namespace boost;
  namespace e = example;

  typedef int (*func_ptr)(float, double);
  typedef int (&func_ref)(float, double);
  typedef int (X::*mem_func_ptr)(float);
  typedef int (X::*mem_func_ptr_c)(float) const;
  typedef int (X::*mem_func_ptr_v)(float) volatile;
  typedef int (X::*mem_func_ptr_cv)(float) const volatile;

  BOOST_STATIC_ASSERT((is_same<e::result_of<int_result_type(float)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<e::result_of<int_result_of(double)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<e::result_of<int_result_of(void)>::type, void>::value));
  BOOST_STATIC_ASSERT((is_same<e::result_of<const int_result_of(double)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<e::result_of<volatile int_result_of(void)>::type, void>::value));
  BOOST_STATIC_ASSERT((is_same<e::result_of<int_result_type_and_float_result_of(char)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<e::result_of<func_ptr(char, float)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<e::result_of<func_ref(char, float)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<e::result_of<mem_func_ptr(X,char)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<e::result_of<mem_func_ptr_c(X,char)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<e::result_of<mem_func_ptr_v(X,char)>::type, int>::value));
  BOOST_STATIC_ASSERT((is_same<e::result_of<mem_func_ptr_cv(X,char)>::type, int>::value));
  return 0;
}