95 lines
3.5 KiB
C++
95 lines
3.5 KiB
C++
|
|
// Copyright Catch2 Authors
|
|
// Distributed under the Boost Software License, Version 1.0.
|
|
// (See accompanying file LICENSE.txt or copy at
|
|
// https://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
|
|
#include <catch2/catch_test_macros.hpp>
|
|
#include <catch2/internal/catch_is_permutation.hpp>
|
|
|
|
#include <helpers/range_test_helpers.hpp>
|
|
|
|
#include <array>
|
|
|
|
namespace {
|
|
template <typename Range1, typename Range2>
|
|
static bool is_permutation(Range1 const& r1, Range2 const& r2) {
|
|
using std::begin; using std::end;
|
|
return Catch::Detail::is_permutation(
|
|
begin( r1 ), end( r1 ), begin( r2 ), end( r2 ), std::equal_to<>{} );
|
|
}
|
|
}
|
|
|
|
TEST_CASE("is_permutation", "[algorithms][approvals]") {
|
|
SECTION( "Handle empty ranges" ) {
|
|
std::array<int, 0> empty;
|
|
std::array<int, 2> non_empty{ { 2, 3 } };
|
|
REQUIRE( is_permutation( empty, empty ) );
|
|
REQUIRE_FALSE( is_permutation( empty, non_empty ) );
|
|
REQUIRE_FALSE( is_permutation( non_empty, empty ) );
|
|
}
|
|
SECTION( "Different length ranges" ) {
|
|
std::array<int, 6> arr1{ { 1, 3, 5, 7, 8, 9 } };
|
|
// arr2 is prefix of arr1
|
|
std::array<int, 4> arr2{ { 1, 3, 5, 7 } };
|
|
// arr3 shares prefix with arr1 and arr2, but is not a permutation
|
|
std::array<int, 5> arr3{ { 1, 3, 5, 9, 8 } };
|
|
REQUIRE_FALSE( is_permutation( arr1, arr2 ) );
|
|
REQUIRE_FALSE( is_permutation( arr1, arr3 ) );
|
|
REQUIRE_FALSE( is_permutation( arr2, arr3 ) );
|
|
}
|
|
SECTION( "Same length ranges" ) {
|
|
SECTION( "Shared elements, but different counts" ) {
|
|
const std::array<int, 6>
|
|
arr1{ { 1, 1, 1, 1, 2, 2 } },
|
|
arr2{ { 1, 1, 2, 2, 2, 2 } };
|
|
REQUIRE_FALSE( is_permutation( arr1, arr2 ) );
|
|
}
|
|
SECTION( "Identical ranges" ) {
|
|
const std::array<int, 6>
|
|
arr1{ { 1, 1, 1, 1, 2, 2 } },
|
|
arr2{ { 1, 1, 2, 2, 2, 2 } };
|
|
REQUIRE( is_permutation( arr1, arr1 ) );
|
|
REQUIRE( is_permutation( arr2, arr2 ) );
|
|
}
|
|
SECTION( "Completely distinct elements" ) {
|
|
// Completely distinct elements
|
|
const std::array<int, 4>
|
|
arr1{ { 1, 2, 3, 4 } },
|
|
arr2{ { 10, 20, 30, 40 } };
|
|
REQUIRE_FALSE( is_permutation( arr1, arr2 ) );
|
|
}
|
|
SECTION( "Reverse ranges" ) {
|
|
const std::array<int, 5>
|
|
arr1{ { 1, 2, 3, 4, 5 } },
|
|
arr2{ { 5, 4, 3, 2, 1 } };
|
|
REQUIRE( is_permutation( arr1, arr2 ) );
|
|
}
|
|
SECTION( "Shared prefix & permuted elements" ) {
|
|
const std::array<int, 5>
|
|
arr1{ { 1, 1, 2, 3, 4 } },
|
|
arr2{ { 1, 1, 4, 2, 3 } };
|
|
REQUIRE( is_permutation( arr1, arr2 ) );
|
|
}
|
|
SECTION( "Permutations with element count > 1" ) {
|
|
const std::array<int, 7>
|
|
arr1{ { 2, 2, 3, 3, 3, 1, 1 } },
|
|
arr2{ { 3, 2, 1, 3, 2, 1, 3 } };
|
|
REQUIRE( is_permutation( arr1, arr2 ) );
|
|
}
|
|
}
|
|
}
|
|
|
|
TEST_CASE("is_permutation supports iterator + sentinel pairs",
|
|
"[algorithms][is-permutation][approvals]") {
|
|
const has_different_begin_end_types<int>
|
|
range_1{ 1, 2, 3, 4 },
|
|
range_2{ 4, 3, 2, 1 };
|
|
REQUIRE( is_permutation( range_1, range_2 ) );
|
|
|
|
const has_different_begin_end_types<int> range_3{ 3, 3, 2, 1 };
|
|
REQUIRE_FALSE( is_permutation( range_1, range_3 ) );
|
|
}
|