136 lines
4.2 KiB
C++
136 lines
4.2 KiB
C++
/*=============================================================================
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Copyright (c) 2007 Tobias Schwinger
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Use modification and distribution are subject to the Boost Software
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License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt).
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==============================================================================*/
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#include <boost/config.hpp>
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#ifdef BOOST_MSVC
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# pragma warning(disable: 4244) // no conversion warnings, please
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#endif
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#include <boost/core/lightweight_test.hpp>
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#include <boost/functional/lightweight_forward_adapter.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/blank.hpp>
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#include <boost/noncopyable.hpp>
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#include <memory>
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template <class Base = boost::blank>
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class test_func : public Base
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{
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int val;
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public:
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test_func(int v) : val(v) { }
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template<class B>
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test_func(test_func<B> const & that)
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: val(that.val)
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{ }
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template<class B> friend class test_func;
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int operator()(int & l, int const & r) const
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{
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return l=r+val;
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}
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long operator()(int & l, int const & r)
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{
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return -(l=r+val);
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}
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char operator()(int & l, int & r)
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{
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return l=r+val;
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}
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template <typename Sig>
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struct result
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{
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typedef void type;
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};
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// ensure result_of argument types are what's expected
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// note: this is *not* how client code should look like
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template <class Self>
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struct result< Self const(int&,int const&) > { typedef int type; };
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template <class Self>
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struct result< Self(int&,int const&) > { typedef long type; };
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template <class Self>
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struct result< Self(int&,int&) > { typedef char type; };
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};
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enum { int_, long_, char_ };
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int type_of(int) { return int_; }
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int type_of(long) { return long_; }
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int type_of(char) { return char_; }
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int main()
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{
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{
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using boost::is_same;
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using boost::result_of;
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typedef boost::lightweight_forward_adapter< test_func<> > f;
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typedef boost::reference_wrapper<int> ref;
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typedef boost::reference_wrapper<int const> cref;
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// lvalue,rvalue
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BOOST_TEST(( is_same<
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result_of< f(ref, int) >::type, long >::value ));
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BOOST_TEST(( is_same<
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result_of< f const (ref, int) >::type, int >::value ));
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// lvalue,const lvalue
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BOOST_TEST(( is_same<
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result_of< f(ref, cref) >::type, long >::value ));
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BOOST_TEST(( is_same<
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result_of< f const (ref, cref) >::type, int >::value ));
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// lvalue,lvalue
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BOOST_TEST(( is_same<
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result_of< f(ref, ref) >::type, char >::value ));
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// result_of works differently for C++11 here, so compare
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// with using it against test_func.
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BOOST_TEST(( is_same<
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result_of< f const (ref, ref) >::type,
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result_of< test_func<> const (int&, int&) >::type >::value ));
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}
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{
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using boost::noncopyable;
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using boost::lightweight_forward_adapter;
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int v = 0; boost::reference_wrapper<int> x(v);
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test_func<noncopyable> f(7);
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lightweight_forward_adapter< test_func<> > func(f);
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lightweight_forward_adapter< test_func<noncopyable> & > func_ref(f);
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lightweight_forward_adapter< test_func<noncopyable> & > const func_ref_c(f);
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lightweight_forward_adapter< test_func<> const > func_c(f);
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lightweight_forward_adapter< test_func<> > const func_c2(f);
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lightweight_forward_adapter< test_func<noncopyable> const & > func_c_ref(f);
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BOOST_TEST( type_of( func(x,1) ) == long_ );
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BOOST_TEST( type_of( func_ref(x,1) ) == long_ );
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BOOST_TEST( type_of( func_ref_c(x,1) ) == long_ );
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BOOST_TEST( type_of( func_c(x,1) ) == int_ );
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BOOST_TEST( type_of( func_c2(x,1) ) == int_ );
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BOOST_TEST( type_of( func_c_ref(x,1) ) == int_ );
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BOOST_TEST( type_of( func(x,x) ) == char_ );
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BOOST_TEST( func(x,1) == -8 );
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BOOST_TEST( func_ref(x,1) == -8 );
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BOOST_TEST( func_ref_c(x,1) == -8 );
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BOOST_TEST( func_c(x,1) == 8 );
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BOOST_TEST( func_c2(x,1) == 8 );
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BOOST_TEST( func_c_ref(x,1) == 8 );
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}
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return boost::report_errors();
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}
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