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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/util/ranges/functional.h"
#include <vector>
#include "testing/gtest/include/gtest/gtest.h"
namespace util {
TEST(RangesTest, Identity) {
static constexpr identity id;
std::vector<int> v;
EXPECT_EQ(&v, &id(v));
constexpr int arr = {0};
static_assert(arr == id(arr), "");
}
TEST(RangesTest, Invoke) {
struct S {
int data_member = 123;
int member_function() { return 42; }
};
S s;
EXPECT_EQ(123, invoke(&S::data_member, s));
EXPECT_EQ(42, invoke(&S::member_function, s));
auto add_functor = [](int i, int j) { return i + j; };
EXPECT_EQ(3, invoke(add_functor, 1, 2));
}
TEST(RangesTest, EqualTo) {
ranges::equal_to eq;
EXPECT_TRUE(eq(0, 0));
EXPECT_FALSE(eq(0, 1));
EXPECT_FALSE(eq(1, 0));
}
TEST(RangesTest, Less) {
ranges::less lt;
EXPECT_FALSE(lt(0, 0));
EXPECT_TRUE(lt(0, 1));
EXPECT_FALSE(lt(1, 0));
}
} // namespace util
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