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// This source code is released into the public domain.
#include <catch2/catch_test_macros.hpp>
import nihil.std;
import nihil.util;
namespace {
struct test_tag
{
};
using testflags = nihil::flagset<unsigned, test_tag>;
constexpr auto zero = testflags::bit<0>();
constexpr auto one = testflags::bit<1>();
constexpr auto two = testflags::bit<2>();
constexpr auto twelve = testflags::bit<12>();
TEST_CASE("flagset: invariant", "[nihil]")
{
static_assert(std::regular<testflags>);
static_assert(sizeof(testflags) == sizeof(testflags::underlying_type));
}
TEST_CASE("flagset: bit<>", "[nihil]")
{
REQUIRE(zero.value() == 0x1);
REQUIRE(one.value() == 0x2);
}
TEST_CASE("flagset: mask<>", "[nihil]")
{
auto zero_ = testflags::mask<0x1>();
auto one_ = testflags::mask<0x2>();
REQUIRE(zero_ == zero);
REQUIRE(one_ == one);
}
TEST_CASE("flagset: constructor", "[nihil]")
{
SECTION ("default construct") {
auto flags = testflags();
REQUIRE(flags.value() == 0);
}
SECTION ("construct from int") {
auto flags = testflags::from_int(one.value() | zero.value());
REQUIRE(flags == (one | zero));
}
SECTION ("copy construct") {
auto flags = one;
auto flags2(flags);
REQUIRE(flags == flags2);
}
}
TEST_CASE("flagset: operators", "[nihil]")
{
SECTION ("operator|") {
REQUIRE((zero | one).value() == 0x3);
}
SECTION ("operator|=") {
auto flags = zero;
flags |= one;
REQUIRE(flags.value() == 0x3);
}
SECTION ("operator&") {
auto flags = zero | one;
REQUIRE((flags & zero) == zero);
}
SECTION ("operator&=") {
auto flags = zero | one | two;
REQUIRE(flags.value() == 0x7);
flags &= (zero | one);
REQUIRE(flags.value() == 0x3);
}
SECTION ("operator^") {
auto flags = zero | one;
REQUIRE((flags ^ (one | two)) == (zero | two));
}
SECTION ("operator^=") {
auto flags = zero | one;
flags ^= (one | two);
REQUIRE(flags == (zero | two));
}
SECTION ("operator~") {
auto flags = ~zero;
REQUIRE(flags.value() == ~static_cast<unsigned>(1));
}
SECTION ("operator==") {
auto flags = zero;
REQUIRE(flags == zero);
REQUIRE(flags != one);
}
}
TEST_CASE("flagset: assignment", "[nihil]")
{
auto flags = zero;
REQUIRE(flags == zero);
flags = one;
REQUIRE(flags == one);
REQUIRE(flags != zero);
}
TEST_CASE("flagset: format", "[nihil]")
{
REQUIRE(std::format("{}", testflags()) == "<>");
REQUIRE(std::format("{}", zero) == "<0>");
REQUIRE(std::format("{}", one) == "<1>");
REQUIRE(std::format("{}", zero | one) == "<1,0>");
REQUIRE(std::format("{}", twelve) == "<12>");
REQUIRE(std::format("{}", twelve | one) == "<12,1>");
}
TEST_CASE("flagset: ostream operator<<", "[nihil]")
{
auto write = [](testflags flags) -> std::string {
auto strm = std::ostringstream();
strm << flags;
return strm.str();
};
REQUIRE(write(testflags()) == "<>");
REQUIRE(write(zero) == "<0>");
REQUIRE(write(one) == "<1>");
REQUIRE(write(zero | one) == "<1,0>");
REQUIRE(write(twelve) == "<12>");
REQUIRE(write(twelve | one) == "<12,1>");
}
} // anonymous namespace
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