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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/functional/function_ref.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
char Moo(float) {
return 'a';
}
struct C {
long Method() { return value; }
long value;
};
} // namespace
TEST(FunctionRefTest, FreeFunction) {
[](FunctionRef<char(float)> ref) { EXPECT_EQ('a', ref(1.0)); }(&Moo);
}
TEST(FunctionRefTest, Method) {
[](FunctionRef<long(C*)> ref) {
C c = {.value = 25L};
EXPECT_EQ(25L, ref(&c));
}(&C::Method);
}
TEST(FunctionRefTest, Lambda) {
int x = 3;
auto lambda = [&x]() { return x; };
[](FunctionRef<int()> ref) { EXPECT_EQ(3, ref()); }(lambda);
}
// Tests for passing a `base::FunctionRef` as an `absl::FunctionRef`.
TEST(FunctionRefTest, AbslConversion) {
// Matching signatures should work.
{
bool called = false;
auto lambda = [&called](float) {
called = true;
return 'a';
};
FunctionRef<char(float)> ref(lambda);
[](absl::FunctionRef<char(float)> absl_ref) {
absl_ref(1.0);
}(ref.ToAbsl());
EXPECT_TRUE(called);
}
// `absl::FunctionRef` should be able to adapt "similar enough" signatures.
{
bool called = false;
auto lambda = [&called](float) {
called = true;
return 'a';
};
FunctionRef<char(float)> ref(lambda);
[](absl::FunctionRef<void(float)> absl_ref) {
absl_ref(1.0);
}(ref.ToAbsl());
EXPECT_TRUE(called);
}
}
// base::FunctionRef allows functors with convertible return types to be
// adapted.
TEST(FunctionRefTest, ConvertibleReturnTypes) {
// Hopefully this never results in a postmorterm-worthy bug...
{
auto lambda = []() -> bool { return true; };
[](FunctionRef<int()> ref) { EXPECT_EQ(1, ref()); }(lambda);
}
{
class Base {};
class Derived : public Base {};
auto lambda = []() -> Derived* { return nullptr; };
[](FunctionRef<Base*()> ref) { EXPECT_EQ(nullptr, ref()); }(lambda);
}
}
} // namespace base
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