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proxy_invocation_tests.cpp
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330 lines (290 loc) · 10.6 KB
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// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
#include <gtest/gtest.h>
#include <algorithm>
#include <functional>
#include <list>
#include <map>
#include <ranges>
#include <string>
#include <typeindex>
#include <typeinfo>
#include <vector>
#if defined(_MSC_VER) && !defined(__clang__)
#pragma warning(push)
#pragma warning(disable: 4702) // False alarm from MSVC: warning C4702: unreachable code
#endif // defined(_MSC_VER) && !defined(__clang__)
#include "proxy.h"
#if defined(_MSC_VER) && !defined(__clang__)
#pragma warning(pop)
#endif // defined(_MSC_VER) && !defined(__clang__)
#include "utils.h"
namespace {
namespace spec {
template <class... Os>
struct MovableCallable : pro::facade_builder
::add_convention<pro::operator_dispatch<"()">, Os...>
::build {};
template <class... Os>
struct Callable : pro::facade_builder
::support_copy<pro::constraint_level::nontrivial>
::add_facade<MovableCallable<Os...>>
::build {};
struct Wildcard {
template <class T>
operator T() const noexcept { std::terminate(); }
};
Wildcard NotImplemented(auto&&...) { throw std::runtime_error{ "Not implemented!" }; }
PRO_DEF_WEAK_DISPATCH(WeakOpCall, pro::operator_dispatch<"()">, NotImplemented);
template <class... Os>
struct WeakCallable : pro::facade_builder
::support_copy<pro::constraint_level::nontrivial>
::add_convention<WeakOpCall, Os...>
::build {};
PRO_DEF_FREE_DISPATCH(FreeSize, std::ranges::size, Size);
PRO_DEF_FREE_DISPATCH(FreeForEach, std::ranges::for_each, ForEach);
template <class T>
struct Iterable : pro::facade_builder
::add_convention<FreeForEach, void(std::function<void(T&)>)>
::template add_convention<FreeSize, std::size_t() noexcept>
::build {};
template <class T>
struct Container;
template <class C, class T>
pro::proxy<Container<T>> AppendImpl(C& container, T&& v) {
container.push_back(std::move(v));
return &container;
}
PRO_DEF_FREE_DISPATCH(FreeAppend, AppendImpl, Append);
template <class T>
struct Container : pro::facade_builder
::add_facade<Iterable<T>>
::template add_convention<FreeAppend, pro::proxy<Container<T>>(T) const&>
::build {};
PRO_DEF_MEM_DISPATCH(MemAt, at, at);
PRO_DEF_WEAK_DISPATCH(MemAtWeak, MemAt, NotImplemented);
struct ResourceDictionary : pro::facade_builder
::add_convention<MemAtWeak, std::string(int)>
::build {};
template <class F, class T>
pro::proxy<F> LockImpl(const std::weak_ptr<T>& p) {
auto result = p.lock();
if (static_cast<bool>(result)) {
return result;
}
return nullptr;
}
template <class F>
PRO_DEF_FREE_DISPATCH(FreeLock, LockImpl<F>, Lock);
template <class F>
struct Weak : pro::facade_builder
::support_copy<pro::constraint_level::nontrivial>
::add_convention<FreeLock<F>, pro::proxy<F>()>
::build {};
template <class F, class T>
auto GetWeakImpl(const std::shared_ptr<T>& p) { return pro::make_proxy<Weak<F>, std::weak_ptr<T>>(p); }
template <class F>
PRO_DEF_FREE_DISPATCH(FreeGetWeakImpl, GetWeakImpl<F>, GetWeak);
template <class F>
PRO_DEF_WEAK_DISPATCH(FreeGetWeak, FreeGetWeakImpl<F>, std::nullptr_t);
struct SharedStringable : pro::facade_builder
::add_facade<utils::spec::Stringable>
::add_direct_convention<FreeGetWeak<SharedStringable>, pro::proxy<Weak<SharedStringable>>() const&>
::build {};
} // namespace spec
template <class F, bool NE, class... Args>
concept CallableFacade =
requires(pro::proxy<F> p, Args... args) {
{ (*p)(std::forward<Args>(args)...) };
typename std::enable_if_t<NE == noexcept((*p)(std::forward<Args>(args)...))>;
};
// Static assertions for facade Callable
static_assert(!CallableFacade<spec::Callable<int(double)>, false, std::nullptr_t>); // Wrong arguments
static_assert(CallableFacade<spec::Callable<int(double)>, false, float>); // Invoking without specifying a dispatch
static_assert(CallableFacade<spec::Callable<int(double), void(int) noexcept>, true, int>); // Invoking noexcept overloads
static_assert(CallableFacade<spec::Callable<int(double), void(int) noexcept>, false, double>); // Invoking overloads that may throw
template <class... Args>
std::vector<std::type_index> GetTypeIndices()
{ return {std::type_index{typeid(Args)}...}; }
} // namespace
TEST(ProxyInvocationTests, TestArgumentForwarding) {
std::string arg1 = "My string";
std::vector<int> arg2 = { 1, 2, 3 };
std::vector<int> arg2_copy = arg2;
std::string arg1_received;
std::vector<int> arg2_received;
int expected_result = 456;
auto f = [&](std::string&& s, std::vector<int>&& v) -> int {
arg1_received = std::move(s);
arg2_received = std::move(v);
return expected_result;
};
pro::proxy<spec::Callable<int(std::string, std::vector<int>)>> p = &f;
int result = (*p)(arg1, std::move(arg2));
ASSERT_TRUE(p.has_value());
ASSERT_EQ(arg1_received, arg1);
ASSERT_TRUE(arg2.empty());
ASSERT_EQ(arg2_received, arg2_copy);
ASSERT_EQ(result, expected_result);
}
TEST(ProxyInvocationTests, TestThrow) {
const char* expected_error_message = "My exception";
auto f = [&] { throw std::runtime_error{ expected_error_message }; };
bool exception_thrown = false;
pro::proxy<spec::Callable<void()>> p = &f;
try {
(*p)();
} catch (const std::runtime_error& e) {
exception_thrown = true;
ASSERT_STREQ(e.what(), expected_error_message);
}
ASSERT_TRUE(exception_thrown);
ASSERT_TRUE(p.has_value());
}
TEST(ProxyInvocationTests, TestMultipleDispatches_Unique) {
std::list<int> l = { 1, 2, 3 };
pro::proxy<spec::Iterable<int>> p = &l;
ASSERT_EQ(Size(*p), 3);
int sum = 0;
auto accumulate_sum = [&](int x) { sum += x; };
ForEach(*p, accumulate_sum);
ASSERT_EQ(sum, 6);
}
TEST(ProxyInvocationTests, TestMultipleDispatches_Duplicated) {
struct DuplicatedIterable : pro::facade_builder
::add_convention<spec::FreeForEach, void(std::function<void(int&)>)>
::add_convention<spec::FreeSize, std::size_t()>
::add_convention<spec::FreeForEach, void(std::function<void(int&)>)>
::build {};
static_assert(sizeof(pro::details::facade_traits<DuplicatedIterable>::meta) ==
sizeof(pro::details::facade_traits<spec::Iterable<int>>::meta));
std::list<int> l = { 1, 2, 3 };
pro::proxy<DuplicatedIterable> p = &l;
ASSERT_EQ(Size(*p), 3);
int sum = 0;
auto accumulate_sum = [&](int x) { sum += x; };
ForEach(*p, accumulate_sum);
ASSERT_EQ(sum, 6);
}
TEST(ProxyInvocationTests, TestRecursiveDefinition) {
std::list<int> l = { 1, 2, 3 };
pro::proxy<spec::Container<int>> p = &l;
ASSERT_EQ(Size(*p), 3);
int sum = 0;
auto accumulate_sum = [&](int x) { sum += x; };
ForEach(*p, accumulate_sum);
ASSERT_EQ(sum, 6);
Append(*Append(*Append(*p, 4), 5), 6);
ASSERT_EQ(Size(*p), 6);
sum = 0;
ForEach(*p, accumulate_sum);
ASSERT_EQ(sum, 21);
}
TEST(ProxyInvocationTests, TestOverloadResolution) {
struct OverloadedCallable : pro::facade_builder
::add_convention<pro::operator_dispatch<"()">, void(int), void(double), void(const char*), void(char*), void(std::string, int)>
::build {};
std::vector<std::type_index> side_effect;
auto p = pro::make_proxy<OverloadedCallable>([&](auto&&... args)
{ side_effect = GetTypeIndices<std::decay_t<decltype(args)>...>(); });
(*p)(123);
ASSERT_EQ(side_effect, GetTypeIndices<int>());
(*p)(1.23);
ASSERT_EQ(side_effect, GetTypeIndices<double>());
char foo[2];
(*p)(foo);
ASSERT_EQ(side_effect, GetTypeIndices<char*>());
(*p)("lalala");
ASSERT_EQ(side_effect, GetTypeIndices<const char*>());
(*p)("lalala", 0);
ASSERT_EQ(side_effect, (GetTypeIndices<std::string, int>()));
ASSERT_FALSE((std::is_invocable_v<decltype(*p), std::vector<int>>));
}
TEST(ProxyInvocationTests, TestNoexcept) {
std::vector<std::type_index> side_effect;
auto p = pro::make_proxy<spec::Callable<void(int) noexcept, void(double)>>([&](auto&&... args) noexcept
{ side_effect = GetTypeIndices<std::decay_t<decltype(args)>...>(); });
static_assert(noexcept((*p)(123)));
(*p)(123);
ASSERT_EQ(side_effect, GetTypeIndices<int>());
static_assert(!noexcept((*p)(1.23)));
(*p)(1.23);
ASSERT_EQ(side_effect, GetTypeIndices<double>());
ASSERT_FALSE((std::is_invocable_v<decltype(*p), char*>));
}
TEST(ProxyInvocationTests, TestFunctionPointer) {
struct TestFacade : spec::Callable<std::vector<std::type_index>()> {};
pro::proxy<TestFacade> p{ &GetTypeIndices<int, double> };
auto ret = (*p)();
ASSERT_EQ(ret, (GetTypeIndices<int, double>()));
}
TEST(ProxyInvocationTests, TestMemberDispatchDefault) {
std::vector<std::string> container1{ "hello", "world", "!"};
std::list<std::string> container2{ "hello", "world" };
pro::proxy<spec::ResourceDictionary> p = &container1;
ASSERT_EQ(p->at(0), "hello");
p = &container2;
{
bool exception_thrown = false;
try {
p->at(0);
} catch (const std::runtime_error& e) {
exception_thrown = true;
ASSERT_EQ(static_cast<std::string>(e.what()), "Not implemented!");
}
ASSERT_TRUE(exception_thrown);
}
}
TEST(ProxyInvocationTests, TestFreeDispatchDefault) {
{
int side_effect = 0;
auto p = pro::make_proxy<spec::WeakCallable<void()>>([&] { side_effect = 1; });
(*p)();
ASSERT_EQ(side_effect, 1);
}
{
bool exception_thrown = false;
auto p = pro::make_proxy<spec::WeakCallable<void()>>(123);
try {
(*p)();
} catch (const std::runtime_error& e) {
exception_thrown = true;
ASSERT_EQ(static_cast<std::string>(e.what()), "Not implemented!");
}
ASSERT_TRUE(exception_thrown);
}
}
TEST(ProxyInvocationTests, TestObserverDispatch) {
int test_val = 123;
pro::proxy<spec::SharedStringable> p{std::make_shared<int>(test_val)};
auto weak = GetWeak(p);
ASSERT_TRUE(weak.has_value());
{
auto locked = Lock(*weak);
ASSERT_TRUE(locked.has_value());
ASSERT_EQ(ToString(*locked), "123");
}
p = &test_val; // The underlying std::shared_ptr will be destroyed
ASSERT_TRUE(weak.has_value());
ASSERT_FALSE(Lock(*weak).has_value());
ASSERT_FALSE(GetWeak(p).has_value());
ASSERT_EQ(ToString(*p), "123");
}
TEST(ProxyInvocationTests, TestQualifiedConvention) {
struct TestFacade : pro::facade_builder
::add_convention<pro::operator_dispatch<"()">, int()&, int() const&, int() && noexcept, int() const&&>
::build {};
struct TestCallable {
int operator()()& noexcept { return 0; }
int operator()() const& noexcept { return 1; }
int operator()() && noexcept { return 2; }
int operator()() const&& noexcept { return 3; }
};
pro::proxy<TestFacade> p = pro::make_proxy<TestFacade, TestCallable>();
static_assert(!noexcept((*p)()));
static_assert(noexcept((*std::move(p))()));
ASSERT_EQ((*p)(), 0);
ASSERT_EQ((*std::as_const(p))(), 1);
ASSERT_EQ((*std::move(p))(), 2);
ASSERT_EQ((*std::move(std::as_const(p)))(), 3);
}