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