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Add some utilities to iterator_range for trimming a range and constructing one from a container.

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To be used in clang in a follow-up commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242823 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2015-07-21 18:37:12 +00:00
parent d8a62d931e
commit 2f6af0e277
1 changed files with 12 additions and 0 deletions
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12
include/llvm/ADT/iterator_range.h
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@ -20,6 +20,7 @@
#define LLVM_ADT_ITERATOR_RANGE_H
#include <utility>
#include <iterator>
namespace llvm {
@ -32,6 +33,12 @@ class iterator_range {
IteratorT begin_iterator, end_iterator;
public:
//TODO: Add SFINAE to test that the Container's iterators match the range's
// iterators.
template <typename Container>
iterator_range(Container &&c)
//TODO: Consider ADL/non-member begin/end calls.
: begin_iterator(c.begin()), end_iterator(c.end()) {}
iterator_range(IteratorT begin_iterator, IteratorT end_iterator)
: begin_iterator(std::move(begin_iterator)),
end_iterator(std::move(end_iterator)) {}
@ -51,6 +58,11 @@ template <class T> iterator_range<T> make_range(T x, T y) {
template <typename T> iterator_range<T> make_range(std::pair<T, T> p) {
return iterator_range<T>(std::move(p.first), std::move(p.second));
}
template<typename T>
iterator_range<decltype(begin(std::declval<T>()))> drop_begin(T &&t, int n) {
return make_range(std::next(begin(t), n), end(t));
}
}
#endif