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llvm-project/libcxx/test/std/algorithms/alg.nonmodifying/mismatch/ranges_mismatch.pass.cpp

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// template <input_iterator I1, sentinel_for<_I1> S1, input_iterator I2, sentinel_for<_I2> S2,
// class Pred = ranges::equal_to, class Proj1 = identity, class Proj2 = identity>
// requires indirectly_comparable<I1, I2, Pred, Proj1, Proj2>
// constexpr mismatch_result<_I1, _I2>
// ranges::mismatch()(I1 first1, S1 last1, I2 first2, S2 last2, Pred pred = {}, Proj1 proj1 = {}, Proj2 proj2 = {})
// template <input_range R1, input_range R2,
// class Pred = ranges::equal_to, class Proj1 = identity, class Proj2 = identity>
// requires indirectly_comparable<iterator_t<R1>, iterator_t<R2>, Pred, Proj1, Proj2>
// constexpr mismatch_result<borrowed_iterator_t<R1>, borrowed_iterator_t<R2>>
// ranges::mismatch(R1&& r1, R2&& r2, Pred pred = {}, Proj1 proj1 = {}, Proj2 proj2 = {})
#include <algorithm>
#include <array>
#include <cassert>
#include <functional>
#include <ranges>
#include "test_iterators.h"
template <class Iter1, class Iter2>
constexpr void test_iterators(Iter1 begin1, Iter1 end1, Iter2 begin2, Iter2 end2, int* expected1, int* expected2) {
using Expected = std::ranges::mismatch_result<Iter1, Iter2>;
std::same_as<Expected> auto ret = std::ranges::mismatch(std::move(begin1), sentinel_wrapper<Iter1>(std::move(end1)),
std::move(begin2), sentinel_wrapper<Iter2>(std::move(end2)));
assert(base(ret.in1) == expected1);
assert(base(ret.in2) == expected2);
}
template <class Iter1, class Iter2>
constexpr void test_iters() {
int a[] = {1, 2, 3, 4, 5};
int b[] = {1, 2, 3, 5, 4};
test_iterators(Iter1(a), Iter1(a + 5), Iter2(b), Iter2(b + 5), a + 3, b + 3);
}
constexpr bool test() {
test_iters<cpp17_input_iterator<int*>, cpp17_input_iterator<int*>>();
test_iters<cpp17_input_iterator<int*>, cpp20_input_iterator<int*>>();
test_iters<cpp17_input_iterator<int*>, forward_iterator<int*>>();
test_iters<cpp17_input_iterator<int*>, bidirectional_iterator<int*>>();
test_iters<cpp17_input_iterator<int*>, random_access_iterator<int*>>();
test_iters<cpp17_input_iterator<int*>, contiguous_iterator<int*>>();
test_iters<cpp17_input_iterator<int*>, int*>();
test_iters<cpp20_input_iterator<int*>, cpp17_input_iterator<int*>>();
test_iters<cpp20_input_iterator<int*>, cpp20_input_iterator<int*>>();
test_iters<cpp20_input_iterator<int*>, forward_iterator<int*>>();
test_iters<cpp20_input_iterator<int*>, bidirectional_iterator<int*>>();
test_iters<cpp20_input_iterator<int*>, random_access_iterator<int*>>();
test_iters<cpp20_input_iterator<int*>, contiguous_iterator<int*>>();
test_iters<cpp20_input_iterator<int*>, int*>();
test_iters<forward_iterator<int*>, cpp17_input_iterator<int*>>();
test_iters<forward_iterator<int*>, cpp20_input_iterator<int*>>();
test_iters<forward_iterator<int*>, forward_iterator<int*>>();
test_iters<forward_iterator<int*>, bidirectional_iterator<int*>>();
test_iters<forward_iterator<int*>, random_access_iterator<int*>>();
test_iters<forward_iterator<int*>, contiguous_iterator<int*>>();
test_iters<forward_iterator<int*>, int*>();
test_iters<bidirectional_iterator<int*>, cpp17_input_iterator<int*>>();
test_iters<bidirectional_iterator<int*>, cpp20_input_iterator<int*>>();
test_iters<bidirectional_iterator<int*>, forward_iterator<int*>>();
test_iters<bidirectional_iterator<int*>, bidirectional_iterator<int*>>();
test_iters<bidirectional_iterator<int*>, random_access_iterator<int*>>();
test_iters<bidirectional_iterator<int*>, contiguous_iterator<int*>>();
test_iters<bidirectional_iterator<int*>, int*>();
test_iters<random_access_iterator<int*>, cpp17_input_iterator<int*>>();
test_iters<random_access_iterator<int*>, cpp20_input_iterator<int*>>();
test_iters<random_access_iterator<int*>, forward_iterator<int*>>();
test_iters<random_access_iterator<int*>, bidirectional_iterator<int*>>();
test_iters<random_access_iterator<int*>, random_access_iterator<int*>>();
test_iters<random_access_iterator<int*>, contiguous_iterator<int*>>();
test_iters<random_access_iterator<int*>, int*>();
test_iters<contiguous_iterator<int*>, cpp17_input_iterator<int*>>();
test_iters<contiguous_iterator<int*>, cpp20_input_iterator<int*>>();
test_iters<contiguous_iterator<int*>, forward_iterator<int*>>();
test_iters<contiguous_iterator<int*>, bidirectional_iterator<int*>>();
test_iters<contiguous_iterator<int*>, random_access_iterator<int*>>();
test_iters<contiguous_iterator<int*>, contiguous_iterator<int*>>();
test_iters<contiguous_iterator<int*>, int*>();
test_iters<int*, cpp17_input_iterator<int*>>();
test_iters<int*, cpp20_input_iterator<int*>>();
test_iters<int*, forward_iterator<int*>>();
test_iters<int*, bidirectional_iterator<int*>>();
test_iters<int*, random_access_iterator<int*>>();
test_iters<int*, contiguous_iterator<int*>>();
test_iters<int*, int*>();
{ // test with a range
std::array<int, 5> a = {1, 2, 3, 4, 5};
std::array<int, 5> b = {1, 2, 3, 5, 4};
using Expected = std::ranges::mismatch_result<int*, int*>;
std::same_as<Expected> auto ret = std::ranges::mismatch(a, b);
assert(ret.in1 == a.begin() + 3);
assert(ret.in2 == b.begin() + 3);
}
{ // test with non-iterator sentinel
int a[] = {1, 2, 3, 4, 5};
int b[] = {1, 2, 3, 5, 4};
using Iter = int*;
using Sentinel = sentinel_wrapper<Iter>;
using Expected = std::ranges::mismatch_result<Iter, Iter>;
std::same_as<Expected> auto r = std::ranges::mismatch(Iter(a), Sentinel(a + 5), Iter(b), Sentinel(b + 5));
assert(r.in1 == a + 3);
assert(r.in2 == b + 3);
}
{ // test with different array sizes
{
int a[] = {1, 2, 3};
int b[] = {1, 2};
test_iterators(a, a + 3, b, b + 2, a + 2, b + 2);
using Expected = std::ranges::mismatch_result<int*, int*>;
std::same_as<Expected> auto ret = std::ranges::mismatch(a, b);
assert(ret.in1 == a + 2);
assert(ret.in2 == b + 2);
}
{
int a[] = {1, 2};
int b[] = {1, 2, 3};
test_iterators(a, a + 2, b, b + 3, a + 2, b + 2);
using Expected = std::ranges::mismatch_result<int*, int*>;
std::same_as<Expected> auto ret = std::ranges::mismatch(a, b);
assert(ret.in1 == a + 2);
assert(ret.in2 == b + 2);
}
}
{ // test with borrowed ranges
int r1[] = {1, 2, 3, 4, 5};
int r2[] = {1, 2, 3, 5, 4};
using Expected = std::ranges::mismatch_result<int*, int*>;
{
std::same_as<Expected> auto ret = std::ranges::mismatch(r1, std::views::all(r2));
assert(ret.in1 == r1 + 3);
assert(ret.in2 == r2 + 3);
}
{
std::same_as<Expected> auto ret = std::ranges::mismatch(std::views::all(r1), r2);
assert(ret.in1 == r1 + 3);
assert(ret.in2 == r2 + 3);
}
{
std::same_as<Expected> auto ret = std::ranges::mismatch(std::views::all(r1), std::views::all(r2));
assert(ret.in1 == r1 + 3);
assert(ret.in2 == r2 + 3);
}
}
{ // test structured bindings
int a[] = {1, 2, 3, 4};
int b[] = {1, 2, 4, 8, 16};
auto [ai, bi] = std::ranges::mismatch(a, b);
assert(ai == a + 2);
assert(bi == b + 2);
auto [aj, bj] = std::ranges::mismatch(a, a+4, b, b+5);
assert(aj == a + 2);
assert(bj == b + 2);
}
{ // test predicate
{
int a[] = {7, 6, 9, 3, 5, 1, 2, 4};
int b[] = {6, 5, 8, 2, 5, 1, 2, 4};
auto ret = std::ranges::mismatch(a, a + 8, b, b + 8, std::ranges::greater{});
assert(ret.in1 == a + 4);
assert(ret.in2 == b + 4);
assert(*ret.in1 == 5);
assert(*ret.in2 == 5);
}
{
int a[] = {7, 6, 9, 3, 5, 1, 2, 4};
int b[] = {6, 5, 8, 2, 5, 1, 2, 4};
auto ret = std::ranges::mismatch(a, b, std::ranges::greater{});
assert(ret.in1 == a + 4);
assert(ret.in2 == b + 4);
assert(*ret.in1 == 5);
assert(*ret.in2 == 5);
}
}
{ // test projection
{
int a[] = {7, 6, 9, 3, 5, 1, 2, 4};
int b[] = {6, 5, 8, 2, 5, 1, 2, 4};
auto ret = std::ranges::mismatch(a, b,
std::ranges::greater{},
[](int i) { return i == 5 ? +100 : i; },
[](int i) { return i == 5 ? -100 : i; });
assert(ret.in1 == a + 5);
assert(ret.in2 == b + 5);
assert(*ret.in1 == 1);
assert(*ret.in2 == 1);
}
{
int a[] = {7, 6, 9, 3, 5, 1, 2, 4};
auto ret = std::ranges::mismatch(a, a,
std::less<double>{},
[](int i) { return i * 1.01; },
[c = 0](int i) mutable { return c++ < 5 ? i * 1.02 : i; });
assert(ret.in1 == a + 5);
assert(ret.in2 == a + 5);
assert(*ret.in1 == 1);
assert(*ret.in2 == 1);
}
{
int a[] = {7, 6, 9, 3, 5, 1, 2, 4};
int b[] = {6, 5, 8, 2, 5, 1, 2, 4};
auto ret = std::ranges::mismatch(a, a + 8, b, b + 8,
std::ranges::greater{},
[](int i) { return i == 5 ? +100 : i; },
[](int i) { return i == 5 ? -100 : i; });
assert(ret.in1 == a + 5);
assert(ret.in2 == b + 5);
assert(*ret.in1 == 1);
assert(*ret.in2 == 1);
}
{
int a[] = {7, 6, 9, 3, 5, 1, 2, 4};
auto ret = std::ranges::mismatch(a, a + 8, a, a + 8,
std::less<double>{},
[](int i) { return i * 1.01; },
[c = 0](int i) mutable { return c++ < 5 ? i * 1.02 : i; });
assert(ret.in1 == a + 5);
assert(ret.in2 == a + 5);
assert(*ret.in1 == 1);
assert(*ret.in2 == 1);
}
}
{ // test predicate and projection call count
{
int pred_count = 0;
int proj1_count = 0;
int proj2_count = 0;
int a[] = {7, 6, 9, 3, 5, 1, 2, 4};
auto ret = std::ranges::mismatch(a, a,
[&](int lhs, int rhs) { ++pred_count; return lhs == rhs; },
[&](int i) { ++proj1_count; return i; },
[&](int i) { ++proj2_count; return i; });
assert(ret.in1 == a + 8);
assert(ret.in2 == a + 8);
assert(pred_count == 8);
assert(proj1_count == 8);
assert(proj2_count == 8);
}
{
int pred_count = 0;
int proj1_count = 0;
int proj2_count = 0;
int a[] = {7, 6, 9, 3, 5, 1, 2, 4};
auto ret = std::ranges::mismatch(a, a + 8, a, a + 8,
[&](int lhs, int rhs) { ++pred_count; return lhs == rhs; },
[&](int i) { ++proj1_count; return i; },
[&](int i) { ++proj2_count; return i; });
assert(ret.in1 == a + 8);
assert(ret.in2 == a + 8);
assert(pred_count == 8);
assert(proj1_count == 8);
assert(proj2_count == 8);
}
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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