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#include <kstd/observer_ptr>
#include <kstd/tests/os_panic.hpp>
#include <catch2/catch_test_macros.hpp>
#include <utility>
SCENARIO("Observer Pointer initialization and construction", "[observer_ptr]")
{
GIVEN("An empty context")
{
WHEN("constructing by default")
{
auto ptr = kstd::observer_ptr<int>{};
THEN("the observer pointer is null")
{
REQUIRE_FALSE(ptr);
}
}
WHEN("constructing from a nullptr")
{
auto ptr = kstd::observer_ptr<int>{nullptr};
THEN("the observer pointer is null")
{
REQUIRE_FALSE(ptr);
}
}
WHEN("constructing from a raw pointer")
{
auto value = 1;
auto ptr = kstd::observer_ptr{&value};
THEN("the observer pointer is not null")
{
REQUIRE(ptr);
}
THEN("the observer pointer points to the correct object")
{
REQUIRE(&*ptr == &value);
}
}
WHEN("copy constructing from an existing observer pointer")
{
auto value = 1;
auto ptr = kstd::observer_ptr{&value};
auto copy = ptr;
THEN("the new observer pointer points to the same object as the other observer pointer")
{
REQUIRE(&*copy == &value);
}
}
WHEN("copy constructing from an existing observer pointer with a compatible type")
{
struct A
{
};
struct B : A
{
};
auto value = B{};
auto ptr = kstd::observer_ptr<B>(&value);
auto copy = kstd::observer_ptr<A>(ptr);
THEN("the new observer pointer points to the same object as the other observer pointer")
{
REQUIRE(&*copy == &value);
}
}
WHEN("copy assigning from an existing observer pointer")
{
auto value = 1;
auto ptr = kstd::observer_ptr{&value};
auto copy = ptr;
THEN("the new observer pointer points to the same object as the other observer pointer")
{
REQUIRE(&*copy == &value);
}
}
WHEN("move constructing from an existing observer pointer")
{
auto value = 1;
auto ptr = kstd::observer_ptr{&value};
auto copy = std::move(ptr);
THEN("the new observer pointer points to the same object as the other observer pointer")
{
REQUIRE(&*copy == &value);
}
}
WHEN("move assigning from an existing observer pointer")
{
auto value = 1;
auto ptr = kstd::observer_ptr{&value};
auto copy = std::move(ptr);
THEN("the new observer pointer points to the same object as the other observer pointer")
{
REQUIRE(&*copy == &value);
}
}
}
}
SCENARIO("Observer pointer modifiers", "[observer_ptr]")
{
GIVEN("A non-null observer pointer")
{
auto value = 1;
auto ptr = kstd::observer_ptr{&value};
WHEN("releasing the observer pointer")
{
auto raw_ptr = ptr.release();
THEN("the observer pointer is null")
{
REQUIRE_FALSE(ptr);
}
THEN("the returned pointer points to the correct object")
{
REQUIRE(raw_ptr == &value);
}
}
WHEN("resetting the observer pointer to nullptr")
{
ptr.reset();
THEN("the observer pointer is null")
{
REQUIRE_FALSE(ptr);
}
}
WHEN("resetting the observer pointer to a new object")
{
auto other_value = 2;
ptr.reset(&other_value);
THEN("the observer pointer points to the new object")
{
REQUIRE(&*ptr == &other_value);
}
}
WHEN("swapping it with another observer pointer")
{
auto other_value = 2;
auto other_ptr = kstd::observer_ptr{&other_value};
ptr.swap(other_ptr);
THEN("the observer pointer points to the other object")
{
REQUIRE(&*ptr == &other_value);
}
THEN("the other observer pointer points to the original object")
{
REQUIRE(&*other_ptr == &value);
}
}
}
}
SCENARIO("Observer pointer observers", "[observer_ptr]")
{
GIVEN("A non-null observer pointer")
{
struct A
{
int value{};
constexpr auto operator<=>(A const & other) const noexcept = default;
};
auto value = A{1};
auto ptr = kstd::observer_ptr{&value};
WHEN("getting the raw pointer")
{
auto raw_ptr = ptr.get();
THEN("the raw pointer points to the correct object")
{
REQUIRE(raw_ptr == &value);
}
}
WHEN("dereferencing the observer pointer")
{
auto dereferenced = *ptr;
THEN("the dereferenced value is the correct value")
{
REQUIRE(dereferenced == value);
}
}
WHEN("writing through the observer pointer with the arrow operator")
{
ptr->value = 2;
THEN("the value is updated")
{
REQUIRE(value.value == 2);
}
}
WHEN("converting the observer pointer to a raw pointer")
{
auto raw_ptr = static_cast<A *>(ptr);
THEN("the raw pointer points to the correct object")
{
REQUIRE(raw_ptr == &value);
}
}
}
}
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