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69 lines
2.4 KiB
C++
69 lines
2.4 KiB
C++
//===- iterator_range.h - A range adaptor for iterators ---------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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/// \file
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/// This provides a very simple, boring adaptor for a begin and end iterator
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/// into a range type. This should be used to build range views that work well
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/// with range based for loops and range based constructors.
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///
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/// Note that code here follows more standards-based coding conventions as it
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/// is mirroring proposed interfaces for standardization.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_ITERATOR_RANGE_H
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#define LLVM_ADT_ITERATOR_RANGE_H
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#include <iterator>
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#include <utility>
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namespace llvm {
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/// A range adaptor for a pair of iterators.
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///
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/// This just wraps two iterators into a range-compatible interface. Nothing
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/// fancy at all.
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template <typename IteratorT>
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class iterator_range {
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IteratorT begin_iterator, end_iterator;
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public:
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//TODO: Add SFINAE to test that the Container's iterators match the range's
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// iterators.
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template <typename Container>
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iterator_range(Container &&c)
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//TODO: Consider ADL/non-member begin/end calls.
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: begin_iterator(c.begin()), end_iterator(c.end()) {}
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iterator_range(IteratorT begin_iterator, IteratorT end_iterator)
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: begin_iterator(std::move(begin_iterator)),
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end_iterator(std::move(end_iterator)) {}
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IteratorT begin() const { return begin_iterator; }
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IteratorT end() const { return end_iterator; }
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};
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/// Convenience function for iterating over sub-ranges.
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///
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/// This provides a bit of syntactic sugar to make using sub-ranges
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/// in for loops a bit easier. Analogous to std::make_pair().
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template <class T> iterator_range<T> make_range(T x, T y) {
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return iterator_range<T>(std::move(x), std::move(y));
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}
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template <typename T> iterator_range<T> make_range(std::pair<T, T> p) {
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return iterator_range<T>(std::move(p.first), std::move(p.second));
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}
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template <typename T>
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iterator_range<decltype(adl_begin(std::declval<T>()))> drop_begin(T &&t,
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int n) {
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return make_range(std::next(adl_begin(t), n), adl_end(t));
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}
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}
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#endif
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