| 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 | #include <sstream> |
| 8 | #include <string> |
| 9 | |
| 10 | template<class T> T from_string_1( std::string const& s ) |
| 11 | { |
| 12 | using namespace boost::lambda2; |
| 13 | |
| 14 | std::istringstream is( s ); |
| 15 | |
| 16 | T t{}; |
| 17 | |
| 18 | ( std::ref( t&: is ) >> _1 )( t ); |
| 19 | |
| 20 | return t; |
| 21 | } |
| 22 | |
| 23 | template<class T> T from_string_2( std::string const& s ) |
| 24 | { |
| 25 | using namespace boost::lambda2; |
| 26 | |
| 27 | std::istringstream is( s ); |
| 28 | |
| 29 | T t{}; |
| 30 | |
| 31 | ( is >> _1 )( t ); |
| 32 | |
| 33 | return t; |
| 34 | } |
| 35 | |
| 36 | int main() |
| 37 | { |
| 38 | BOOST_TEST_EQ( from_string_1<int>( "123"), 123 ); |
| 39 | BOOST_TEST_EQ( from_string_2<int>( "456"), 456 ); |
| 40 | |
| 41 | return boost::report_errors(); |
| 42 | } |
| 43 |