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Fix index_based_iterator for const containers.

This commit is contained in:
John Preston 2019-02-17 15:49:24 +04:00
parent 193e454fd4
commit 4d987f7278
1 changed files with 14 additions and 6 deletions
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20
Telegram/SourceFiles/base/index_based_iterator.h
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@ -18,12 +18,20 @@ public:
using value_type = typename Container::value_type; using value_type = typename Container::value_type;
using difference_type = typename Container::difference_type; using difference_type = typename Container::difference_type;
using pointer = typename Container::pointer; using pointer = std::conditional_t<
using reference = typename Container::reference; std::is_const_v<Container>,
typename Container::const_pointer,
typename Container::pointer>;
using reference = std::conditional_t<
std::is_const_v<Container>,
typename Container::const_reference,
typename Container::reference>;
using base_type = std::conditional_t<
std::is_const_v<Container>,
typename Container::const_iterator,
typename Container::iterator>;
index_based_iterator( index_based_iterator(Container *container, base_type impl)
Container *container,
typename Container::iterator impl)
: _container(container) : _container(container)
, _index(impl - _container->begin()) { , _index(impl - _container->begin()) {
} }
@ -99,7 +107,7 @@ public:
return !(*this < other); return !(*this < other);
} }
typename Container::iterator base() const { base_type base() const {
return _container->begin() + _index; return _container->begin() + _index;
} }