3225aaf82b
The new adaptor is like boost::adaptors::indirected, but for std::reference_wrapper values (instead of pointer). It calls .get() on every value and returns the result. It is useful for range-based iteration of ranges of std::reference_wrapper (or related) types.
48 lines
1023 B
C++
48 lines
1023 B
C++
// Boost.Range library
|
|
//
|
|
// Copyright Robin Eckert 2015. Use, modification and distribution is
|
|
// subject to the Boost Software License, Version 1.0. (See
|
|
// accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
//
|
|
//
|
|
// For more information, see http://www.boost.org/libs/range/
|
|
//
|
|
//[ref_unwrapped_example
|
|
#include <boost/range/adaptor/ref_unwrapped.hpp>
|
|
#include <iostream>
|
|
#include <vector>
|
|
|
|
struct example
|
|
{
|
|
int value;
|
|
};
|
|
|
|
int main(int argc, const char* argv[])
|
|
{
|
|
//<-
|
|
#if !defined(BOOST_NO_CXX11_DECLTYPE) \
|
|
&& !defined(BOOST_NO_CXX11_RANGE_BASED_FOR) \
|
|
&& !defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX) \
|
|
&& !defined(BOOST_NO_CXX11_AUTO_DECLARATIONS)
|
|
//->
|
|
using boost::adaptors::ref_unwrapped;
|
|
|
|
example one{1};
|
|
example two{2};
|
|
example three{3};
|
|
|
|
std::vector<std::reference_wrapper<example> > input{one, two, three};
|
|
|
|
for (auto&& entry : input | ref_unwrapped)
|
|
{
|
|
std::cout << entry.value;
|
|
}
|
|
|
|
return 0;
|
|
//<-
|
|
#endif
|
|
//->
|
|
}
|
|
//]
|