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Adding range-based STL-like helper APIs. llvm::distance() is the range version of std::distance. llvm::copy is the range version of std::copy.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203354 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -23,6 +23,11 @@
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namespace llvm {
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template <typename Range>
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struct range_traits {
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typedef typename Range::difference_type difference_type;
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};
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/// \brief 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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@ -32,6 +37,10 @@ class iterator_range {
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IteratorT begin_iterator, end_iterator;
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public:
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// FIXME: We should be using iterator_traits to determine the
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// difference_type, but most of our iterators do not expose anything like it.
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typedef int difference_type;
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iterator_range() {}
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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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@ -41,6 +50,19 @@ public:
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IteratorT end() const { return end_iterator; }
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};
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/// \brief Determine the distance between the end() and begin() iterators of
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/// a range. Analogous to std::distance().
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template <class Range>
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typename range_traits<Range>::difference_type distance(Range R) {
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return std::distance(R.begin(), R.end());
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}
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/// \brief Copies members of a range into the output iterator provided.
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/// Analogous to std::copy.
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template <class Range, class OutputIterator>
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OutputIterator copy(Range In, OutputIterator Result) {
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return std::copy(In.begin(), In.end(), Result);
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}
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}
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#endif
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