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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/Assertions.h"
#include "mozilla/FunctionRef.h"
#include "mozilla/UniquePtr.h"
using mozilla::FunctionRef;
#define CHECK(c) \
do { \
bool cond = !!(c); \
MOZ_RELEASE_ASSERT(cond, "Failed assertion: " #c); \
} while (false)
int addConstRefs(const int& arg1, const int& arg2) { return arg1 + arg2; }
void incrementPointer(int* arg) { (*arg)++; }
int increment(int arg) { return arg + 1; }
int incrementUnique(mozilla::UniquePtr<int> ptr) { return *ptr + 1; }
static bool helloWorldCalled = false;
void helloWorld() { helloWorldCalled = true; }
struct S {
static int increment(int arg) { return arg + 1; }
};
struct Incrementor {
int operator()(int arg) { return arg + 1; }
};
template <typename Fn>
struct Caller;
template <typename Fn, typename... Params>
std::invoke_result_t<Fn, Params...> CallFunctionRef(FunctionRef<Fn> aRef,
Params... aParams) {
return aRef(std::forward<Params>(aParams)...);
}
static void TestNonmemberFunction() {
CHECK(CallFunctionRef<int(int)>(increment, 42) == 43);
}
static void TestStaticMemberFunction() {
CHECK(CallFunctionRef<int(int)>(&S::increment, 42) == 43);
}
static void TestFunctionObject() {
auto incrementor = Incrementor();
CHECK(CallFunctionRef<int(int)>(incrementor, 42) == 43);
}
static void TestFunctionObjectTemporary() {
CHECK(CallFunctionRef<int(int)>(Incrementor(), 42) == 43);
}
static void TestLambda() {
// Test non-capturing lambda
auto lambda1 = [](int arg) { return arg + 1; };
CHECK(CallFunctionRef<int(int)>(lambda1, 42) == 43);
// Test capturing lambda
int one = 1;
auto lambda2 = [one](int arg) { return arg + one; };
CHECK(CallFunctionRef<int(int)>(lambda2, 42) == 43);
CHECK(CallFunctionRef<int(int)>([](int arg) { return arg + 1; }, 42) == 43);
}
static void TestOperatorBool() {
auto ToBool = [](FunctionRef<int(int)> aRef) {
return static_cast<bool>(aRef);
};
CHECK(!ToBool({}));
CHECK(ToBool(increment));
CHECK(!ToBool(nullptr));
}
static void TestReferenceParameters() {
int x = 1;
int y = 2;
CHECK(CallFunctionRef<int(const int&, const int&)>(addConstRefs, x, y) == 3);
}
static void TestVoidNoParameters() {
CHECK(!helloWorldCalled);
CallFunctionRef<void()>(helloWorld);
CHECK(helloWorldCalled);
}
static void TestPointerParameters() {
int x = 1;
CallFunctionRef<void(int*)>(incrementPointer, &x);
CHECK(x == 2);
}
static void TestImplicitFunctorTypeConversion() {
auto incrementor = Incrementor();
short x = 1;
CHECK(CallFunctionRef<long(short)>(incrementor, x) == 2);
}
static void TestImplicitLambdaTypeConversion() {
short x = 1;
CHECK(CallFunctionRef<long(short)>([](short arg) { return arg + 1; }, x) ==
2);
}
static void TestImplicitFunctionPointerTypeConversion() {
short x = 1;
CHECK(CallFunctionRef<long(short)>(&increment, x) == 2);
}
static void TestMoveOnlyArguments() {
CHECK(CallFunctionRef<int(mozilla::UniquePtr<int>)>(
&incrementUnique, mozilla::MakeUnique<int>(5)) == 6);
}
int main() {
TestNonmemberFunction();
TestStaticMemberFunction();
TestFunctionObject();
TestFunctionObjectTemporary();
TestLambda();
TestOperatorBool();
TestReferenceParameters();
TestPointerParameters();
TestVoidNoParameters();
TestImplicitFunctorTypeConversion();
TestImplicitLambdaTypeConversion();
TestImplicitFunctionPointerTypeConversion();
TestMoveOnlyArguments();
printf("TestFunctionRef OK!\n");
return 0;
}
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