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main.cpp
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#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
#include <array>
#include <string>
#include <sstream>
#include <doctest/doctest.h>
#include <magic_enum.hpp>
enum class Color : int {
RED = -10, BLUE = 0, GREEN = 10
};
template<typename E>
auto to_integer(magic_enum::Enum<E> value) {
// magic_enum::Enum<E> - C++17 Concept for enum type.
return static_cast<magic_enum::underlying_type_t<E>>(value);
}
TEST_SUITE ("Example derived tests.") {
TEST_CASE ("Enum variable to string name.") {
/* Example snippet:
*
* // Enum variable to string name.
* Color c1 = Color::RED;
* auto c1_name = magic_enum::enum_name(c1);
* std::cout << c1_name << std::endl; // RED
*/
Color c1 = Color::RED;
REQUIRE(magic_enum::enum_name(c1) == "RED");
}
TEST_CASE ("String enum name sequence.") {
/* Example snippet:
*
* // String enum name sequence.
* constexpr auto& names = magic_enum::enum_names<Color>();
* std::cout << "Color names:";
* for (const auto& n : names) {
* std::cout << " " << n;
* }
* std::cout << std::endl;
* // Color names: RED BLUE GREEN
*/
constexpr auto &names = magic_enum::enum_names<Color>();
std::array<const std::string, 3> const seq{"RED", "BLUE", "GREEN"};
auto index = 0;
for (const auto &n: names) {
if (n != "RED" and n != "BLUE" && n != "GREEN") FAIL ("Unexpected color name");
CHECK(n == seq[index++]);
}
}
TEST_CASE ("String name to enum value.") {
/* Example snippet:
*
* // String name to enum value.
* auto c2 = magic_enum::enum_cast<Color>("BLUE");
* if (c2.has_value()) {
* std::cout << "BLUE = " << to_integer(c2.value()) << std::endl; // BLUE = 0
* }
*/
auto c2 = magic_enum::enum_cast<Color>("BLUE");
CHECK(c2.has_value());
REQUIRE(to_integer(c2.value()) == 0);
}
TEST_CASE ("Integer value to enum value.") {
/* Example snippet:
*
* // Integer value to enum value.
* auto c3 = magic_enum::enum_cast<Color>(10);
* if (c3.has_value()) {
* std::cout << "GREEN = " << magic_enum::enum_integer(c3.value()) << std::endl; // GREEN = 10
* }
*/
auto c3 = magic_enum::enum_cast<Color>(10);
CHECK(c3.has_value());
REQUIRE(magic_enum::enum_integer(c3.value()) == 10);
}
TEST_CASE ("Integer value to enum value.") {
/* Example snippet:
*
* // Enum value to integer value.
* auto c4_integer = magic_enum::enum_integer(Color::RED);
* std::cout << "RED = " << c4_integer << std::endl; // RED = -10
*/
auto c4_integer = magic_enum::enum_integer(Color::RED);
REQUIRE(c4_integer == -10);
}
TEST_CASE ("Ostream operator for enum.") {
/* Example snippet:
*
* using namespace magic_enum::ostream_operators; // out-of-the-box ostream operator for all enums.
* // Ostream operator for enum.
* std::cout << "Color: " << c1 << " " << c2 << " " << c3 << std::endl; // Color: RED BLUE GREEN
*/
Color c1 = Color::RED;
auto c2 = magic_enum::enum_cast<Color>("BLUE");
auto c3 = magic_enum::enum_cast<Color>(10);
using namespace magic_enum::ostream_operators;
std::ostringstream os;
os << "Color: " << c1 << " " << c2 << " " << c3;
REQUIRE(os.str() == "Color: RED BLUE GREEN");
}
TEST_CASE ("Number of enum values.") {
/* Example snippet:
*
* // Number of enum values.
* std::cout << "Color enum size: " << magic_enum::enum_count<Color>() << std::endl; // Color size: 3
*/
REQUIRE(magic_enum::enum_count<Color>() == 3);
}
TEST_CASE ("Indexed access to enum value.") {
/* Example snippet:
*
* // Indexed access to enum value.
* std::cout << "Color[0] = " << magic_enum::enum_value<Color>(0) << std::endl; // Color[0] = RED
*/
REQUIRE(magic_enum::enum_value<Color>(0) == Color::RED);
}
TEST_CASE ("Enum value sequence.") {
/* Example snippet:
*
* // Enum value sequence.
* constexpr auto& values = magic_enum::enum_values<Color>();
* std::cout << "Colors values:";
* for (const auto& c : values) {
* std::cout << " " << c; // Ostream operator for enum.
* }
* std::cout << std::endl;
* // Color sequence: RED BLUE GREEN
*/
constexpr auto &values = magic_enum::enum_values<Color>();
using namespace magic_enum::ostream_operators;
std::ostringstream os;
for (const auto &c: values) os << " " << c;
REQUIRE(os.str() == " RED BLUE GREEN");
}
TEST_CASE ("Support operators.") {
/* Example snippet:
*
* enum class Flags { A = 1, B = 2, C = 4, D = 8 };
* using namespace magic_enum::bitwise_operators; // out-of-the-box bitwise operators for all enums.
* // Support operators: ~, |, &, ^, |=, &=, ^=.
* Flags flag = Flags::A | Flags::C;
* std::cout << flag << std::endl; // 5
*/
enum class Flags {
A = 1, B = 2, C = 4, D = 8
};
using namespace magic_enum::bitwise_operators;
Flags flag = Flags::A | Flags::C;
CHECK(static_cast<int>(flag) == 5);
CHECK(static_cast<int>(~Flags::A) == -2);
CHECK(static_cast<int>(Flags::A & Flags::C) == 0);
flag |= Flags::D;
CHECK(static_cast<int>(flag) == 13);
flag &= Flags::B;
CHECK(static_cast<int>(flag) == 0);
flag ^= Flags::C;
REQUIRE(static_cast<int>(flag) == 4);
}
TEST_CASE ("Type is an Unscoped enumeration.") {
/* Example snippet:
*
* enum class Flags { A = 1, B = 2, C = 4, D = 8 };
* enum color { red, green, blue };
* // Checks whether type is an Unscoped enumeration.
* static_assert(magic_enum::is_unscoped_enum_v<color>);
* static_assert(!magic_enum::is_unscoped_enum_v<Color>);
* static_assert(!magic_enum::is_unscoped_enum_v<Flags>);
*/
enum class Flags {
A = 1, B = 2, C = 4, D = 8
};
enum color {
red, green, blue
};
static_assert(magic_enum::is_unscoped_enum_v<color>);
static_assert(!magic_enum::is_unscoped_enum_v<Color>);
static_assert(!magic_enum::is_unscoped_enum_v<Flags>);
CHECK(magic_enum::is_unscoped_enum_v<color>);
CHECK(!magic_enum::is_unscoped_enum_v<Color>);
REQUIRE(!magic_enum::is_unscoped_enum_v<Flags>);
}
TEST_CASE ("Type is an Unscoped enumeration.") {
/* Example snippet:
*
* enum class Flags { A = 1, B = 2, C = 4, D = 8 };
* enum color { red, green, blue };
* // Checks whether type is an Scoped enumeration.
* static_assert(!magic_enum::is_scoped_enum_v<color>);
* static_assert(magic_enum::is_scoped_enum_v<Color>);
* static_assert(magic_enum::is_scoped_enum_v<Flags>);
*/
enum class Flags {
A = 1, B = 2, C = 4, D = 8
};
enum color {
red, green, blue
};
static_assert(!magic_enum::is_scoped_enum_v<color>);
static_assert(magic_enum::is_scoped_enum_v<Color>);
static_assert(magic_enum::is_scoped_enum_v<Flags>);
CHECK(!magic_enum::is_scoped_enum_v<color>);
CHECK(magic_enum::is_scoped_enum_v<Color>);
REQUIRE(magic_enum::is_scoped_enum_v<Flags>);
}
TEST_CASE ("Enum pair (value enum, string enum name) sequence.") {
/* Example snippet:
*
* // Enum pair (value enum, string enum name) sequence.
* constexpr auto& entries = magic_enum::enum_entries<Color>();
* std::cout << "Colors entries:";
* for (const auto& e : entries) {
* std::cout << " " << e.second << " = " << static_cast<int>(e.first);
* }
* std::cout << std::endl;
* // Color entries: RED = -10 BLUE = 0 GREEN = 10
*/
constexpr auto &entries = magic_enum::enum_entries<Color>();
for (const auto &e: entries) {
auto label = e.second;
auto value = static_cast<int>(e.first);
INFO("Color entry: ", label, " = ", value);
switch (value) {
case -10:
CHECK(label == "RED");
break;
case 0:
CHECK(label == "BLUE");
break;
case 10:
CHECK(label == "GREEN");
break;
default:
FAIL("Unknown value");
}
}
}
}