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Add operator->*

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This commit is contained in:
Peter Dimov 2021-09-05 05:24:39 +03:00
parent e6a538a98e
commit 0c1898100a
3 changed files with 71 additions and 0 deletions
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8
include/boost/lambda2/lambda2.hpp
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@ -258,6 +258,14 @@ auto operator>>( A& a, B&& b )
return std::bind( lambda2_detail::right_shift(), std::ref(a), std::forward<B>(b) );
}
// operator->*
template<class A, class B, class = lambda2_detail::enable_unary_lambda<A>>
auto operator->*( A&& a, B&& b )
{
return std::bind( std::forward<B>(b), std::forward<A>(a) );
}
} // namespace lambda2
} // namespace boost

1
test/Jamfile
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@ -26,3 +26,4 @@ run subscript.cpp ;
run compound.cpp ;
run stream_insert.cpp ;
run stream_extract.cpp ;
run project.cpp ;

62
test/project.cpp Normal file
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@ -0,0 +1,62 @@
// Copyright 2021 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/lambda2.hpp>
#include <boost/core/lightweight_test.hpp>
#include <utility>
struct X
{
int m1;
int m2;
int f1() const
{
return m1;
}
int& f2()
{
return m2;
}
};
int main()
{
using namespace boost::lambda2;
{
X const x{ 1, 2 };
BOOST_TEST_EQ( (_1->*&X::m1)( x ), 1 );
BOOST_TEST_EQ( (_1->*&X::m2)( x ), 2 );
BOOST_TEST_EQ( (_1->*&X::f1)( x ), 1 );
}
{
X x{ 0, 0 };
BOOST_TEST_EQ( (_1->*&X::m1)( x ), 0 );
BOOST_TEST_EQ( (_1->*&X::m2)( x ), 0 );
BOOST_TEST_EQ( (_1->*&X::f1)( x ), 0 );
BOOST_TEST_EQ( (_1->*&X::f2)( x ), 0 );
BOOST_TEST_EQ( (_1->*&X::m1 += 1)( x ), 1 );
BOOST_TEST_EQ( (_1->*&X::m2 += 2)( x ), 2 );
BOOST_TEST_EQ( (_1->*&X::f1)( x ), 1 );
BOOST_TEST_EQ( (_1->*&X::f2)( x ), 2 );
BOOST_TEST_EQ( (_1->*&X::f2 += 3)( x ), 5 );
}
{
std::pair<int, int> const x( 1, 2 );
BOOST_TEST_EQ( (_1->*&std::pair<int, int>::first)( x ), 1 );
BOOST_TEST_EQ( (_1->*&std::pair<int, int>::second)( x ), 2 );
}
return boost::report_errors();
}