ba1920fe4b
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@171452 91177308-0d34-0410-b5e6-96231b3b80d8
45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <iterator>
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// template <BidirectionalIterator Iter>
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// Iter prev(Iter x, Iter::difference_type n = 1);
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#include <iterator>
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#include <cassert>
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#include "../../../iterators.h"
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template <class It>
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void
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test(It i, typename std::iterator_traits<It>::difference_type n, It x)
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{
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assert(std::prev(i, n) == x);
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}
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template <class It>
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void
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test(It i, It x)
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{
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assert(std::prev(i) == x);
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}
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int main()
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{
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const char* s = "1234567890";
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test(bidirectional_iterator<const char*>(s+10), 10, bidirectional_iterator<const char*>(s));
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test(random_access_iterator<const char*>(s+10), 10, random_access_iterator<const char*>(s));
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test(s+10, 10, s);
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test(bidirectional_iterator<const char*>(s+1), bidirectional_iterator<const char*>(s));
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test(random_access_iterator<const char*>(s+1), random_access_iterator<const char*>(s));
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test(s+1, s);
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}
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