boostorg/iterator
1
0
Fork 1
mirror of https://github.com/boostorg/iterator.git synced 2025-07-16 22:22:19 +02:00
Code Issues Packages Projects Releases Wiki Activity

Support lambda expressions in function_input_iterator

Browse Source
This commit is contained in:
nekko1119
2015-12-28 02:45:49 +09:00
parent 711a0232f8
commit c09c8ca2b2
2 changed files with 22 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
include/boost/iterator/function_input_iterator.hpp
View File

@ -17,6 +17,7 @@
#include <boost/iterator/iterator_facade.hpp>
#include <boost/none.hpp>
#include <boost/optional/optional.hpp>
#include <boost/utility/result_of.hpp>
namespace boost {
@ -28,9 +29,9 @@ namespace iterators {
class function_input_iterator
: public iterator_facade<
function_input_iterator<Function, Input>,
typename Function::result_type,
BOOST_DEDUCED_TYPENAME result_of<Function ()>::type,
single_pass_traversal_tag,
typename Function::result_type const &
BOOST_DEDUCED_TYPENAME result_of<Function ()>::type const &
>
{
public:
@ -46,7 +47,7 @@ namespace iterators {
++state;
}
typename Function::result_type const &
BOOST_DEDUCED_TYPENAME result_of<Function ()>::type const &
dereference() const {
return (value ? value : value = (*f)()).get();
}
@ -58,7 +59,7 @@ namespace iterators {
private:
Function * f;
Input state;
mutable optional<typename Function::result_type> value;
mutable optional<BOOST_DEDUCED_TYPENAME result_of<Function ()>::type> value;
};
template <class Function, class Input>