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#include <catch2/catch.hpp>
#include <vcpkg/base/optional.h>
#include <vector>
namespace
{
struct identity_projection
{
template<class T>
const T& operator()(const T& val) noexcept
{
return val;
}
};
}
TEST_CASE ("equal", "[optional]")
{
using vcpkg::Optional;
CHECK(Optional<int>{} == Optional<int>{});
CHECK_FALSE(Optional<int>{} == Optional<int>{42});
CHECK_FALSE(Optional<int>{42} == Optional<int>{});
CHECK_FALSE(Optional<int>{1729} == Optional<int>{42});
CHECK(Optional<int>{42} == Optional<int>{42});
}
TEST_CASE ("common_projection", "[optional]")
{
using vcpkg::common_projection;
std::vector<int> input;
CHECK(!common_projection(input, identity_projection{}).has_value());
input.push_back(42);
CHECK(common_projection(input, identity_projection{}).value_or_exit(VCPKG_LINE_INFO) == 42);
input.push_back(42);
CHECK(common_projection(input, identity_projection{}).value_or_exit(VCPKG_LINE_INFO) == 42);
input.push_back(1729);
CHECK(!common_projection(input, identity_projection{}).has_value());
}
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