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view: add increment and decrement operators

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This commit is contained in:
Danny Robson 2021-12-16 13:48:23 +10:00
parent 452328957d
commit 462e2e6ad1
1 changed files with 31 additions and 0 deletions
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31
view.hpp
View File

@ -22,6 +22,9 @@
#include <stdexcept> #include <stdexcept>
#include <iterator> #include <iterator>
#include <type_traits> #include <type_traits>
#include <concepts>
#include <iterator>
namespace cruft { namespace cruft {
template <typename BeginT, typename EndT = BeginT> template <typename BeginT, typename EndT = BeginT>
@ -729,6 +732,34 @@ namespace cruft {
} }
///////////////////////////////////////////////////////////////////////////
template <std::bidirectional_iterator IteratorT>
cruft::view<IteratorT>&
operator-= (
cruft::view<IteratorT> &val,
typename std::iterator_traits<IteratorT>::difference_type offset
) {
return val = {
val.begin () - offset,
val.end () - offset
};
}
//-------------------------------------------------------------------------
template <std::incrementable IteratorT>
cruft::view<IteratorT>&
operator+= (
cruft::view<IteratorT> &val,
typename std::iterator_traits<IteratorT>::difference_type offset
) {
return val = {
val.begin () + offset,
val.end () + offset
};
}
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
template <typename BeginT, typename EndT, typename FunctionT> template <typename BeginT, typename EndT, typename FunctionT>
view<BeginT, EndT> view<BeginT, EndT>