f5256e16df
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103516 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
2.2 KiB
C++
75 lines
2.2 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 distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <deque>
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// Optimization for deque::iterators
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// template <class InputIterator, class OutputIterator>
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// OutputIterator
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// copy_backward(InputIterator first, InputIterator last, OutputIterator result);
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#include <deque>
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#include <cassert>
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#include "../../../iterators.h"
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std::deque<int>
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make(int size, int start = 0 )
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{
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const int b = 4096 / sizeof(int);
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int init = 0;
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if (start > 0)
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{
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init = (start+1) / b + ((start+1) % b != 0);
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init *= b;
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--init;
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}
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std::deque<int> c(init, 0);
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for (int i = 0; i < init-start; ++i)
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c.pop_back();
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for (int i = 0; i < size; ++i)
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c.push_back(i);
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for (int i = 0; i < start; ++i)
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c.pop_front();
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return c;
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};
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void testN(int start, int N)
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{
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typedef std::deque<int> C;
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typedef C::iterator I;
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typedef C::const_iterator CI;
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typedef random_access_iterator<I> RAI;
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typedef random_access_iterator<CI> RACI;
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C c1 = make(N, start);
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C c2 = make(N);
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assert(std::copy_backward(c1.cbegin(), c1.cend(), c2.end()) == c2.begin());
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assert(c1 == c2);
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assert(std::copy_backward(c2.cbegin(), c2.cend(), c1.end()) == c1.begin());
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assert(c1 == c2);
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assert(std::copy_backward(c1.cbegin(), c1.cend(), RAI(c2.end())) == RAI(c2.begin()));
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assert(c1 == c2);
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assert(std::copy_backward(c2.cbegin(), c2.cend(), RAI(c1.end())) == RAI(c1.begin()));
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assert(c1 == c2);
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assert(std::copy_backward(RACI(c1.cbegin()), RACI(c1.cend()), c2.end()) == c2.begin());
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assert(c1 == c2);
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assert(std::copy_backward(RACI(c2.cbegin()), RACI(c2.cend()), c1.end()) == c1.begin());
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assert(c1 == c2);
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}
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int main()
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{
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int rng[] = {0, 1, 2, 3, 1023, 1024, 1025, 2047, 2048, 2049};
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const int N = sizeof(rng)/sizeof(rng[0]);
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for (int i = 0; i < N; ++i)
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for (int j = 0; j < N; ++j)
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testN(rng[i], rng[j]);
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}
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