diff options
Diffstat (limited to 'lib/util.h')
| -rw-r--r-- | lib/util.h | 31 |
1 files changed, 31 insertions, 0 deletions
@@ -58,6 +58,37 @@ namespace QMatrixClient static void qAsConst(const T &&) Q_DECL_EQ_DELETE; #endif + /** An abstraction over a pair of iterators + * This is a very basic range type over a container with iterators that + * are at least ForwardIterators. Inspired by Ranges TS. + */ + template <typename ArrayT> + class Range + { + // Looking forward for Ranges TS to produce something (in C++23?..) + using iterator = typename ArrayT::iterator; + using const_iterator = typename ArrayT::const_iterator; + using size_type = typename ArrayT::size_type; + public: + Range(ArrayT& arr) : from(std::begin(arr)), to(std::end(arr)) { } + Range(iterator from, iterator to) : from(from), to(to) { } + + size_type size() const + { + Q_ASSERT(std::distance(from, to) >= 0); + return size_type(std::distance(from, to)); + } + bool empty() const { return from == to; } + const_iterator begin() const { return from; } + const_iterator end() const { return to; } + iterator begin() { return from; } + iterator end() { return to; } + + private: + iterator from; + iterator to; + }; + /** A guard pointer that disconnects an interested object upon destruction * It's almost QPointer<> except that you have to initialise it with one * more additional parameter - a pointer to a QObject that will be |