BlackMATov/enum.hpp
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basic structure and tests

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This commit is contained in:
Matvey Cherevko
2019-11-20 22:56:22 +07:00
parent d1cf05f3cf
commit 2b18d09dc8
2 changed files with 297 additions and 1 deletions
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135
headers/enum.hpp/enum.hpp
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@@ -6,6 +6,141 @@
#pragma once
#include <cstddef>
#include <stdexcept>
#include <string_view>
namespace enum_hpp
{
class exception final : public std::runtime_error {
public:
explicit exception(const char* what)
: std::runtime_error(what) {}
};
}
//
// ENUM_HPP_GENERATE_INTERNAL_NAMES
//
#define ENUM_HPP_GENERATE_INTERNAL_NAMES(Fields)
//
// ENUM_HPP_GENERATE_ENUM_FIELDS
//
#define ENUM_HPP_GENERATE_ENUM_FIELDS(Fields)
//
// ENUM_HPP_GENERATE_VALUES
//
#define ENUM_HPP_GENERATE_VALUES(Enum, Fields)\
Enum(0),
//
// ENUM_HPP_GENERATE_NAMES
//
#define ENUM_HPP_GENERATE_NAMES(Fields)\
"",
//
// ENUM_HPP_ENUM_CLASS
//
#define ENUM_HPP_ENUM_CLASS(Enum, Type, Fields)\
enum class Enum : Type {\
ENUM_HPP_GENERATE_ENUM_FIELDS(Fields)\
};\
struct Enum##_traits {\
private:\
enum enum_names_for_this_score_ { ENUM_HPP_GENERATE_INTERNAL_NAMES(Fields) };\
public:\
static constexpr std::size_t size = ENUM_HPP_PP_SEQ_SIZE(Fields);\
static constexpr const Enum values[] = { ENUM_HPP_GENERATE_VALUES(Enum, Fields) }; \
static constexpr const std::string_view names[] = { ENUM_HPP_GENERATE_NAMES(Fields) };\
public:\
static constexpr std::string_view to_string(Enum e) noexcept {\
for ( std::size_t i = 0; i < size; ++i) {\
if ( e == values[i] ) {\
return names[i];\
}\
}\
return std::string_view();\
}\
\
static Enum from_string(std::string_view name){\
for ( std::size_t i = 0; i < size; ++i) {\
if ( name == names[i] ) {\
return values[i];\
}\
}\
throw ::enum_hpp::exception(#Enum "_traits::from_string(): invalid argument");\
}\
\
static constexpr bool from_string_nothrow(std::string_view name, Enum& result) noexcept {\
for ( std::size_t i = 0; i < size; ++i) {\
if ( name == names[i] ) {\
result = values[i];\
return true;\
}\
}\
return false;\
}\
};
// -----------------------------------------------------------------------------
//
// ENUM_HPP_PP
//
// -----------------------------------------------------------------------------
//
// ENUM_HPP_PP_CAT
//
#define ENUM_HPP_PP_CAT(x, y) ENUM_HPP_PP_CAT_I(x, y)
#define ENUM_HPP_PP_CAT_I(x, y) x ## y
//
// ENUM_HPP_PP_APPLY
//
#define ENUM_HPP_PP_APPLY(m, ...)\
m(__VA_ARGS__)
//
// ENUM_HPP_PP_SEQ_HEAD
//
#define ENUM_HPP_PP_SEQ_HEAD(Seq) ENUM_HPP_PP_SEQ_HEAD_I(ENUM_HPP_PP_SEQ_HEAD_II Seq)
#define ENUM_HPP_PP_SEQ_HEAD_I(x) ENUM_HPP_PP_SEQ_HEAD_III(x)
#define ENUM_HPP_PP_SEQ_HEAD_II(x) x, ENUM_HPP_PP_SEQ_NOTHING
#define ENUM_HPP_PP_SEQ_HEAD_III(x, _) x
//
// ENUM_HPP_PP_SEQ_TAIL
//
#define ENUM_HPP_PP_SEQ_TAIL(Seq) ENUM_HPP_PP_SEQ_TAIL_I Seq
#define ENUM_HPP_PP_SEQ_TAIL_I(_)
//
// ENUM_HPP_PP_SEQ_SIZE
//
#define ENUM_HPP_PP_SEQ_SIZE(Seq)\
ENUM_HPP_PP_CAT(ENUM_HPP_PP_SEQ_SIZE_, ENUM_HPP_PP_SEQ_SIZE_0 Seq)
#define ENUM_HPP_PP_SEQ_SIZE_0(_) ENUM_HPP_PP_SEQ_SIZE_1
#define ENUM_HPP_PP_SEQ_SIZE_1(_) ENUM_HPP_PP_SEQ_SIZE_2
#define ENUM_HPP_PP_SEQ_SIZE_2(_) ENUM_HPP_PP_SEQ_SIZE_3
#define ENUM_HPP_PP_SEQ_SIZE_3(_) ENUM_HPP_PP_SEQ_SIZE_4
#define ENUM_HPP_PP_SEQ_SIZE_ENUM_HPP_PP_SEQ_SIZE_0 0
#define ENUM_HPP_PP_SEQ_SIZE_ENUM_HPP_PP_SEQ_SIZE_1 1
#define ENUM_HPP_PP_SEQ_SIZE_ENUM_HPP_PP_SEQ_SIZE_2 2
#define ENUM_HPP_PP_SEQ_SIZE_ENUM_HPP_PP_SEQ_SIZE_3 3
#define ENUM_HPP_PP_SEQ_SIZE_ENUM_HPP_PP_SEQ_SIZE_4 4

163
untests/enum_tests.cpp
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@@ -9,5 +9,166 @@
#include <enum.hpp/enum.hpp>
TEST_CASE("enum") {
#include <iterator>
#include <string_view>
#include <type_traits>
using namespace std::string_view_literals;
namespace
{
template < typename Enum >
constexpr std::underlying_type_t<Enum> enum_to_underlying(Enum e) noexcept {
return static_cast<std::underlying_type_t<Enum>>(e);
}
}
namespace some_namespace
{
ENUM_HPP_ENUM_CLASS(color, unsigned,
(red = 2)
(green)
(blue = red + 4)
)
struct render {
ENUM_HPP_ENUM_CLASS(mask, unsigned char,
(none)
(color = 1 << 0)
(alpha = 1 << 1)
(all = color | alpha)
)
};
}
TEST_CASE("enum_pp") {
SECTION("seq_head") {
REQUIRE("head"sv == ENUM_HPP_PP_SEQ_HEAD(("head")));
REQUIRE("head"sv == ENUM_HPP_PP_SEQ_HEAD(("head")("tail")));
REQUIRE("head"sv == ENUM_HPP_PP_SEQ_HEAD(("head")("tail1")("tail2")));
}
SECTION("seq_tail") {
const auto tail0 = [](){ return true; };
REQUIRE(tail0 ENUM_HPP_PP_SEQ_TAIL(("head")));
const auto tail1 = [](auto t){
REQUIRE("tail"sv == t);
return true;
};
REQUIRE(tail1 ENUM_HPP_PP_SEQ_TAIL(("head")("tail")));
const auto tail2 = [](auto t1){
REQUIRE("tail1"sv == t1);
return [](auto t2){
REQUIRE("tail2"sv == t2);
return true;
};
};
REQUIRE(tail2 ENUM_HPP_PP_SEQ_TAIL(("head")("tail1")("tail2")));
}
SECTION("seq_size") {
STATIC_REQUIRE(ENUM_HPP_PP_SEQ_SIZE() == 0);
STATIC_REQUIRE(ENUM_HPP_PP_SEQ_SIZE((a)) == 1);
STATIC_REQUIRE(ENUM_HPP_PP_SEQ_SIZE((a)(b)) == 2);
STATIC_REQUIRE(ENUM_HPP_PP_SEQ_SIZE((a)(b)(c)) == 3);
}
}
TEST_CASE("enum") {
namespace sn = some_namespace;
SECTION("declaration") {
{
STATIC_REQUIRE(std::is_same_v<
std::underlying_type_t<sn::color>,
unsigned>);
// REQUIRE(enum_to_underlying(sn::color::red) == 2);
// REQUIRE(enum_to_underlying(sn::color::green) == 3);
// REQUIRE(enum_to_underlying(sn::color::blue) == 6);
}
{
STATIC_REQUIRE(std::is_same_v<
std::underlying_type_t<sn::render::mask>,
unsigned char>);
// REQUIRE(enum_to_underlying(sn::render::mask::none) == 0);
// REQUIRE(enum_to_underlying(sn::render::mask::color) == 1);
// REQUIRE(enum_to_underlying(sn::render::mask::alpha) == 2);
// REQUIRE(enum_to_underlying(sn::render::mask::all) == 3);
}
}
SECTION("size") {
{
REQUIRE(sn::color_traits::size == 3);
// REQUIRE(sn::color_traits::size == std::size(sn::color_traits::names));
// REQUIRE(sn::color_traits::size == std::size(sn::color_traits::values));
}
{
REQUIRE(sn::render::mask_traits::size == 4);
// REQUIRE(sn::render::mask_traits::size == std::size(sn::render::mask_traits::names));
// REQUIRE(sn::render::mask_traits::size == std::size(sn::render::mask_traits::values));
}
}
SECTION("to_string") {
{
// STATIC_REQUIRE(sn::color_traits::to_string(sn::color::red) == "red");
// STATIC_REQUIRE(sn::color_traits::to_string(sn::color::green) == "green");
// STATIC_REQUIRE(sn::color_traits::to_string(sn::color::blue) == "blue");
// STATIC_REQUIRE(sn::color_traits::to_string(sn::color(42)) == "");
}
{
// STATIC_REQUIRE(sn::render::mask_traits_traits::to_string(sn::render::mask::none) == "none");
// STATIC_REQUIRE(sn::render::mask_traits_traits::to_string(sn::render::mask::color) == "color");
// STATIC_REQUIRE(sn::render::mask_traits_traits::to_string(sn::render::mask::alpha) == "alpha");
// STATIC_REQUIRE(sn::render::mask_traits_traits::to_string(sn::render::mask::all) == "all");
}
}
SECTION("from_string") {
{
// REQUIRE(sn::color_traits::from_string("red") == sn::color::red);
// REQUIRE(sn::color_traits::from_string("green") == sn::color::green);
// REQUIRE(sn::color_traits::from_string("blue") == sn::color::blue);
// REQUIRE_THROWS_AS(sn::color_traits::from_string("42"), enum_hpp::exception);
}
{
// REQUIRE(sn::render::mask_traits_traits::from_string("none") == sn::render::mask_traits::none);
// REQUIRE(sn::render::mask_traits_traits::from_string("color") == sn::render::mask_traits::color);
// REQUIRE(sn::render::mask_traits_traits::from_string("alpha") == sn::render::mask_traits::alpha);
// REQUIRE(sn::render::mask_traits_traits::from_string("all") == sn::render::mask_traits::all);
// REQUIRE_THROWS_AS(sn::render::mask_traits_traits::from_string("42"), enum_hpp::exception);
}
}
SECTION("from_string_nothrow") {
{
// sn::color result{42};
// STATIC_REQUIRE(sn::color_traits::from_string_nothrow("red", result));
// STATIC_REQUIRE(result == sn::color::red);
// STATIC_REQUIRE(sn::color_traits::from_string_nothrow("green", result));
// STATIC_REQUIRE(result == sn::color::green);
// STATIC_REQUIRE(sn::color_traits::from_string_nothrow("blue", result));
// STATIC_REQUIRE(result == sn::color::blue);
// STATIC_REQUIRE_FALSE(sn::color_traits::from_string_nothrow("42", result));
// STATIC_REQUIRE(result == sn::color::blue);
}
{
// sn::render::mask result{42};
// STATIC_REQUIRE(sn::render::mask_traits::from_string_nothrow("none", result));
// STATIC_REQUIRE(result == sn::render::mask::none);
// STATIC_REQUIRE(sn::render::mask_traits::from_string_nothrow("color", result));
// STATIC_REQUIRE(result == sn::render::mask::color);
// STATIC_REQUIRE(sn::render::mask_traits::from_string_nothrow("alpha", result));
// STATIC_REQUIRE(result == sn::render::mask::alpha);
// STATIC_REQUIRE(sn::render::mask_traits::from_string_nothrow("all", result));
// STATIC_REQUIRE(result == sn::render::mask::all);
// STATIC_REQUIRE_FALSE(sn::render::mask_traits::from_string_nothrow("42", result));
// STATIC_REQUIRE(result == sn::render::mask::all);
}
}
}