1// Copyright 2021 Peter Dimov
2// Distributed under the Boost Software License, Version 1.0.
3// https://www.boost.org/LICENSE_1_0.txt
4
5#include <boost/lambda2.hpp>
6#include <boost/core/lightweight_test.hpp>
7
8namespace N
9{
10 struct Irrelevant {};
11 void operator+( Irrelevant, Irrelevant );
12
13 int plus_one( int i )
14 {
15 using namespace boost::lambda2;
16 return (_1 + 1)( i );
17 }
18}
19
20int main()
21{
22 BOOST_TEST_EQ( N::plus_one( 4 ), 5 );
23 return boost::report_errors();
24}
25

source code of boost/libs/lambda2/test/lookup_problem.cpp