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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "android-base/function_ref.h"
#include <gtest/gtest.h>
#include <functional>
#include <string>
namespace android::base {
TEST(function_ref, Ctor) {
// Making sure it can be constructed in all meaningful ways
using EmptyFunc = function_ref<void()>;
EmptyFunc f1([] {});
struct Functor {
void operator()() const {}
};
EmptyFunc f2(Functor{});
Functor fctr;
EmptyFunc f3(fctr);
EmptyFunc f4(std::function<void()>([f1, f2, f3] {
(void)f1;
(void)f2;
(void)f3;
}));
const std::function<void()> func = [] {};
EmptyFunc f5(func);
static_assert(sizeof(f1) <= 2 * sizeof(void*), "Too big function_ref");
static_assert(sizeof(f2) <= 2 * sizeof(void*), "Too big function_ref");
static_assert(sizeof(f3) <= 2 * sizeof(void*), "Too big function_ref");
static_assert(sizeof(f4) <= 2 * sizeof(void*), "Too big function_ref");
static_assert(sizeof(f5) <= 2 * sizeof(void*), "Too big function_ref");
}
TEST(function_ref, Call) {
function_ref<int(int)> view = [](int i) { return i + 1; };
EXPECT_EQ(1, view(0));
EXPECT_EQ(-1, view(-2));
function_ref<std::string(std::string)> fs = [](const std::string& s) { return s + "1"; };
EXPECT_STREQ("s1", fs("s").c_str());
EXPECT_STREQ("ssss1", fs("ssss").c_str());
std::string base;
auto lambda = [&base]() { return base + "1"; };
function_ref<std::string()> fs2 = lambda;
base = "one";
EXPECT_STREQ("one1", fs2().c_str());
base = "forty two";
EXPECT_STREQ("forty two1", fs2().c_str());
}
TEST(function_ref, CopyAndAssign) {
function_ref<int(int)> view = [](int i) { return i + 1; };
EXPECT_EQ(1, view(0));
view = [](int i) { return i - 1; };
EXPECT_EQ(0, view(1));
function_ref<int(int)> view2 = view;
EXPECT_EQ(view(10), view2(10));
view = view2;
EXPECT_EQ(view(10), view2(10));
}
} // namespace android::base
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