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More constexpr (re P0202) - equal and mismatch

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@322527 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2018-01-16 02:04:10 +00:00
parent 5af38a078e
commit 4cd596538b
5 changed files with 164 additions and 22 deletions
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44
test/std/algorithms/alg.nonmodifying/mismatch/mismatch_pred.pass.cpp
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@@ -12,8 +12,12 @@
// template<InputIterator Iter1, InputIterator Iter2,
// Predicate<auto, Iter1::value_type, Iter2::value_type> Pred>
// requires CopyConstructible<Pred>
// pair<Iter1, Iter2>
// constexpr pair<Iter1, Iter2> // constexpr after c++17
// mismatch(Iter1 first1, Iter1 last1, Iter2 first2, Pred pred);
//
// template<InputIterator Iter1, InputIterator Iter2, Predicate Pred>
// constexpr pair<Iter1, Iter2> // constexpr after c++17
// mismatch(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2, Pred pred); // C++14
#include <algorithm>
#include <functional>
@@ -23,6 +27,44 @@
#include "test_iterators.h"
#include "counting_predicates.hpp"
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool eq(int a, int b) { return a == b; }
TEST_CONSTEXPR bool test_constexpr() {
int ia[] = {1, 3, 6, 7};
int ib[] = {1, 3};
int ic[] = {1, 3, 5, 7};
typedef input_iterator<int*> II;
typedef bidirectional_iterator<int*> BI;
auto p1 = std::mismatch(std::begin(ia), std::end(ia), std::begin(ic), eq);
if (p1.first != ia+2 || p1.second != ic+2)
return false;
auto p2 = std::mismatch(std::begin(ia), std::end(ia), std::begin(ic), std::end(ic), eq);
if (p2.first != ia+2 || p2.second != ic+2)
return false;
auto p3 = std::mismatch(std::begin(ib), std::end(ib), std::begin(ic), eq);
if (p3.first != ib+2 || p3.second != ic+2)
return false;
auto p4 = std::mismatch(std::begin(ib), std::end(ib), std::begin(ic), std::end(ic), eq);
if (p4.first != ib+2 || p4.second != ic+2)
return false;
auto p5 = std::mismatch(II(std::begin(ib)), II(std::end(ib)), II(std::begin(ic)), eq);
if (p5.first != II(ib+2) || p5.second != II(ic+2))
return false;
auto p6 = std::mismatch(BI(std::begin(ib)), BI(std::end(ib)), BI(std::begin(ic)), BI(std::end(ic)), eq);
if (p6.first != BI(ib+2) || p6.second != BI(ic+2))
return false;
return true;
}
#endif
#if TEST_STD_VER > 11
#define HAS_FOUR_ITERATOR_VERSION
#endif