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#include <wil/wistd_functional.h>
#include "common.h"
#include "test_objects.h"
// Test methods/objects
int GetValue()
{
return 42;
}
int GetOtherValue()
{
return 8;
}
int Negate(int value)
{
return -value;
}
int Add(int lhs, int rhs)
{
return lhs + rhs;
}
TEST_CASE("WistdFunctionTests::CallOperatorTest", "[wistd]")
{
wistd::function<int()> getValue = GetValue;
REQUIRE(GetValue() == getValue());
wistd::function<int(int)> negate = Negate;
REQUIRE(Negate(42) == negate(42));
wistd::function<int(int, int)> add = Add;
REQUIRE(Add(42, 8) == add(42, 8));
}
TEST_CASE("WistdFunctionTests::AssignmentOperatorTest", "[wistd]")
{
wistd::function<int()> fn = GetValue;
REQUIRE(GetValue() == fn());
fn = GetOtherValue;
REQUIRE(GetOtherValue() == fn());
}
#ifdef WIL_ENABLE_EXCEPTIONS
TEST_CASE("WistdFunctionTests::StdFunctionConstructionTest", "[wistd]")
{
// We should be able to capture a std::function in a wistd::function
wistd::function<int()> fn;
{
value_holder holder{ 42 };
std::function<int()> stdFn = [holder]()
{
return holder.value;
};
fn = stdFn;
}
REQUIRE(42 == fn());
}
#endif
TEST_CASE("WistdFunctionTests::CopyConstructionTest", "[wistd]")
{
object_counter_state state;
{
wistd::function<int()> copyFrom = [counter = object_counter{ state }]()
{
return counter.state->copy_count;
};
REQUIRE(0 == copyFrom());
auto copyTo = copyFrom;
REQUIRE(1 == copyTo());
}
REQUIRE(0 == state.instance_count());
}
TEST_CASE("WistdFunctionTests::CopyAssignmentTest", "[wistd]")
{
object_counter_state state;
{
wistd::function<int()> copyTo;
{
wistd::function<int()> copyFrom = [counter = object_counter{ state }]()
{
return counter.state->copy_count;
};
REQUIRE(0 == copyFrom());
copyTo = copyFrom;
}
REQUIRE(1 == copyTo());
}
REQUIRE(0 == state.instance_count());
}
TEST_CASE("WistdFunctionTests::MoveConstructionTest", "[wistd]")
{
object_counter_state state;
{
wistd::function<int()> moveFrom = [counter = object_counter{ state }]()
{
return counter.state->copy_count;
};
REQUIRE(0 == moveFrom());
auto moveTo = std::move(moveFrom);
REQUIRE(0 == moveTo());
// Because we move the underlying function object, we _must_ invalidate the moved from function
REQUIRE_FALSE(moveFrom != nullptr);
}
REQUIRE(0 == state.instance_count());
}
TEST_CASE("WistdFunctionTests::MoveAssignmentTest", "[wistd]")
{
object_counter_state state;
{
wistd::function<int()> moveTo;
{
wistd::function<int()> moveFrom = [counter = object_counter{ state }]()
{
return counter.state->copy_count;
};
REQUIRE(0 == moveFrom());
moveTo = std::move(moveFrom);
}
REQUIRE(0 == moveTo());
}
REQUIRE(0 == state.instance_count());
}
TEST_CASE("WistdFunctionTests::SwapTest", "[wistd]")
{
object_counter_state state;
{
wistd::function<int()> first;
wistd::function<int()> second;
first.swap(second);
REQUIRE_FALSE(first != nullptr);
REQUIRE_FALSE(second != nullptr);
first = [counter = object_counter{ state }]()
{
return counter.state->copy_count;
};
first.swap(second);
REQUIRE_FALSE(first != nullptr);
REQUIRE(second != nullptr);
REQUIRE(0 == second());
first.swap(second);
REQUIRE(first != nullptr);
REQUIRE_FALSE(second != nullptr);
REQUIRE(0 == first());
second = [counter = object_counter{ state }]()
{
return counter.state->copy_count;
};
first.swap(second);
REQUIRE(first != nullptr);
REQUIRE(second != nullptr);
REQUIRE(0 == first());
}
REQUIRE(0 == state.instance_count());
}
// MSVC's optimizer has had issues with wistd::function in the past when forwarding wistd::function objects to a
// function that accepts the arguments by value. This test exercises the workaround that we have in place. Note
// that this of course requires building with optimizations enabled
void ForwardingTest(wistd::function<int()> getValue, wistd::function<int(int)> negate, wistd::function<int(int, int)> add)
{
// Previously, this would cause a runtime crash
REQUIRE(Add(GetValue(), Negate(8)) == add(getValue(), negate(8)));
}
template <typename... Args>
void CallForwardingTest(Args&&... args)
{
ForwardingTest(wistd::forward<Args>(args)...);
}
TEST_CASE("WistdFunctionTests::OptimizationRegressionTest", "[wistd]")
{
CallForwardingTest(
wistd::function<int()>(GetValue),
wistd::function<int(int)>(Negate),
wistd::function<int(int, int)>(Add));
}
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