BlackMATov/enum.hpp
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add to_string_or_empty and to_index_or_invalid traits functions

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This commit is contained in:
Matvey Cherevko
2019-11-22 05:00:36 +07:00
parent 35d63b1b37
commit 080acf3611
2 changed files with 53 additions and 0 deletions
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19
headers/enum.hpp/enum.hpp
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@@ -10,6 +10,12 @@
#include <string_view>
#include <type_traits>
namespace enum_hpp
{
constexpr std::size_t invalid_index = std::size_t(-1);
constexpr std::string_view empty_string = std::string_view();
}
namespace enum_hpp::detail
{
template < typename Enum >
@@ -124,6 +130,12 @@ namespace enum_hpp::detail
}\
return std::nullopt;\
}\
static constexpr std::string_view to_string_or_empty(Enum e) noexcept {\
if ( auto s = to_string(e) ) {\
return *s;\
}\
return ::enum_hpp::empty_string;\
}\
\
static constexpr std::optional<Enum> from_string(std::string_view name) noexcept {\
for ( std::size_t i = 0; i < size; ++i) {\
@@ -143,6 +155,13 @@ namespace enum_hpp::detail
return std::nullopt;\
}\
\
static constexpr std::size_t to_index_or_invalid(Enum e) noexcept {\
if ( auto i = to_index(e) ) {\
return *i;\
}\
return ::enum_hpp::invalid_index;\
}\
\
static constexpr std::optional<Enum> from_index(std::size_t index) noexcept {\
if ( index < size ) {\
return values[index];\

34
untests/enum_tests.cpp
View File

@@ -133,19 +133,36 @@ TEST_CASE("enum") {
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_or_empty(sn::color::red) == "red");
STATIC_REQUIRE(sn::color_traits::to_string_or_empty(sn::color::green) == "green");
STATIC_REQUIRE(sn::color_traits::to_string_or_empty(sn::color::blue) == "blue");
STATIC_REQUIRE_FALSE(sn::color_traits::to_string(sn::color(42)));
STATIC_REQUIRE(sn::color_traits::to_string_or_empty(sn::color(42)) == "");
}
{
STATIC_REQUIRE(sn::render::mask_traits::to_string(sn::render::mask::none) == "none");
STATIC_REQUIRE(sn::render::mask_traits::to_string(sn::render::mask::color) == "color");
STATIC_REQUIRE(sn::render::mask_traits::to_string(sn::render::mask::alpha) == "alpha");
STATIC_REQUIRE(sn::render::mask_traits::to_string(sn::render::mask::all) == "all");
STATIC_REQUIRE(sn::render::mask_traits::to_string_or_empty(sn::render::mask::none) == "none");
STATIC_REQUIRE(sn::render::mask_traits::to_string_or_empty(sn::render::mask::color) == "color");
STATIC_REQUIRE(sn::render::mask_traits::to_string_or_empty(sn::render::mask::alpha) == "alpha");
STATIC_REQUIRE(sn::render::mask_traits::to_string_or_empty(sn::render::mask::all) == "all");
}
{
STATIC_REQUIRE(sn::numbers_traits::to_string(sn::_0) == "_0");
STATIC_REQUIRE(sn::numbers_traits::to_string(sn::_180) == "_180");
STATIC_REQUIRE(sn::numbers_traits::to_string(sn::_240) == "_240");
STATIC_REQUIRE(sn::numbers_traits::to_string_or_empty(sn::_0) == "_0");
STATIC_REQUIRE(sn::numbers_traits::to_string_or_empty(sn::_180) == "_180");
STATIC_REQUIRE(sn::numbers_traits::to_string_or_empty(sn::_240) == "_240");
STATIC_REQUIRE_FALSE(sn::numbers_traits::to_string(sn::numbers(100500)));
STATIC_REQUIRE(sn::numbers_traits::to_string_or_empty(sn::numbers(100500)) == "");
}
}
@@ -175,19 +192,36 @@ TEST_CASE("enum") {
STATIC_REQUIRE(sn::color_traits::to_index(sn::color::red) == 0u);
STATIC_REQUIRE(sn::color_traits::to_index(sn::color::green) == 1u);
STATIC_REQUIRE(sn::color_traits::to_index(sn::color::blue) == 2u);
STATIC_REQUIRE(sn::color_traits::to_index_or_invalid(sn::color::red) == 0u);
STATIC_REQUIRE(sn::color_traits::to_index_or_invalid(sn::color::green) == 1u);
STATIC_REQUIRE(sn::color_traits::to_index_or_invalid(sn::color::blue) == 2u);
STATIC_REQUIRE_FALSE(sn::color_traits::to_index(sn::color(42)));
STATIC_REQUIRE(sn::color_traits::to_index_or_invalid(sn::color(42)) == enum_hpp::invalid_index);
}
{
STATIC_REQUIRE(sn::render::mask_traits::to_index(sn::render::mask::none) == 0u);
STATIC_REQUIRE(sn::render::mask_traits::to_index(sn::render::mask::color) == 1u);
STATIC_REQUIRE(sn::render::mask_traits::to_index(sn::render::mask::alpha) == 2u);
STATIC_REQUIRE(sn::render::mask_traits::to_index(sn::render::mask::all) == 3u);
STATIC_REQUIRE(sn::render::mask_traits::to_index_or_invalid(sn::render::mask::none) == 0u);
STATIC_REQUIRE(sn::render::mask_traits::to_index_or_invalid(sn::render::mask::color) == 1u);
STATIC_REQUIRE(sn::render::mask_traits::to_index_or_invalid(sn::render::mask::alpha) == 2u);
STATIC_REQUIRE(sn::render::mask_traits::to_index_or_invalid(sn::render::mask::all) == 3u);
}
{
STATIC_REQUIRE(sn::numbers_traits::to_index(sn::_0) == 0u);
STATIC_REQUIRE(sn::numbers_traits::to_index(sn::_180) == 180u);
STATIC_REQUIRE(sn::numbers_traits::to_index(sn::_240) == 240u);
STATIC_REQUIRE(sn::numbers_traits::to_index_or_invalid(sn::_0) == 0u);
STATIC_REQUIRE(sn::numbers_traits::to_index_or_invalid(sn::_180) == 180u);
STATIC_REQUIRE(sn::numbers_traits::to_index_or_invalid(sn::_240) == 240u);
STATIC_REQUIRE_FALSE(sn::numbers_traits::to_index(sn::numbers(100500)));
STATIC_REQUIRE(sn::numbers_traits::to_index_or_invalid(sn::numbers(100500)) == enum_hpp::invalid_index);
}
}