120 lines
2.8 KiB
C++
120 lines
2.8 KiB
C++
// Copyright 2020 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/ranges/ranges.h"
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#include <array>
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#include <initializer_list>
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#include <vector>
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#include "testing/gtest/include/gtest/gtest.h"
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namespace base {
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namespace {
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// Test struct with free function overloads for begin and end. Tests whether the
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// free functions are found.
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struct S {
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std::vector<int> v;
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};
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auto begin(const S& s) {
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return s.v.begin();
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}
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auto end(const S& s) {
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return s.v.end();
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}
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// Test struct with both member and free function overloads for begin and end.
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// Tests whether the member function is preferred.
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struct T {
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constexpr int begin() const { return 1; }
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constexpr int end() const { return 1; }
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};
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constexpr int begin(const T& t) {
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return 2;
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}
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constexpr int end(const T& t) {
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return 2;
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}
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// constexpr utility to generate a std::array. Ensures that a mutable array can
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// be used in a constexpr context.
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template <size_t N>
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constexpr std::array<int, N> GenerateArray() {
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std::array<int, N> arr{};
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int i = 0;
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for (auto* it = ranges::begin(arr); it != ranges::end(arr); ++it) {
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*it = i++;
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}
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return arr;
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}
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} // namespace
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TEST(RangesTest, BeginPrefersMember) {
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constexpr T t;
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static_assert(ranges::begin(t) == 1, "");
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}
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TEST(RangesTest, BeginConstexprContainers) {
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int arr[1]{};
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static_assert(arr == ranges::begin(arr), "");
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static constexpr std::initializer_list<int> il = {1, 2, 3};
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static_assert(il.begin() == ranges::begin(il), "");
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static constexpr std::array<int, 3> array = {1, 2, 3};
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static_assert(&array[0] == ranges::begin(array), "");
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}
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TEST(RangesTest, BeginRegularContainers) {
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std::vector<int> vec;
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S s;
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EXPECT_EQ(vec.begin(), ranges::begin(vec));
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EXPECT_EQ(s.v.begin(), ranges::begin(s));
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}
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TEST(RangesTest, EndPrefersMember) {
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constexpr T t;
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static_assert(ranges::end(t) == 1, "");
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}
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TEST(RangesTest, EndConstexprContainers) {
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int arr[1]{};
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static_assert(arr + 1 == ranges::end(arr), "");
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static constexpr std::initializer_list<int> il = {1, 2, 3};
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static_assert(il.end() == ranges::end(il), "");
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static constexpr std::array<int, 3> array = {1, 2, 3};
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static_assert(&array[0] + 3 == ranges::end(array), "");
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}
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TEST(RangesTest, EndRegularContainers) {
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std::vector<int> vec;
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S s;
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EXPECT_EQ(vec.end(), ranges::end(vec));
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EXPECT_EQ(s.v.end(), ranges::end(s));
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}
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TEST(RangesTest, BeginEndStdArray) {
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static constexpr std::array<int, 0> null_array = GenerateArray<0>();
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static_assert(ranges::begin(null_array) == ranges::end(null_array), "");
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static constexpr std::array<int, 3> array = GenerateArray<3>();
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static_assert(array[0] == 0, "");
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static_assert(array[1] == 1, "");
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static_assert(array[2] == 2, "");
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}
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} // namespace base
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