49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
#pragma once
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// system includes
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#include <optional>
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#include <string>
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// local includes
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#include "cppmacros.h"
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// These two macros make it possible to define a typesafe enum with parse and
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// toString methods
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#define DECLARE_TYPESAFE_ENUM_HELPER1(name) name,
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#define DECLARE_TYPESAFE_ENUM_HELPER2(name) case TheEnum::name: return #name;
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#define DECLARE_TYPESAFE_ENUM_HELPER3(name) else if (str == CPP_STRINGIFY(name)) return TheEnum::name;
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#define DECLARE_TYPESAFE_ENUM_HELPER4(name) cb(TheEnum::name, CPP_STRINGIFY(name));
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#define DECLARE_TYPESAFE_ENUM(Name, Derivation, Values) \
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enum class Name Derivation \
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{ \
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Values(DECLARE_TYPESAFE_ENUM_HELPER1) \
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}; \
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std::string toString(Name value); \
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std::optional<Name> parse##Name(std::string_view str); \
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template<typename T> \
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void iterate##Name(T &&cb) \
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{ \
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using TheEnum = Name; \
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Values(DECLARE_TYPESAFE_ENUM_HELPER4) \
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}
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#define IMPLEMENT_TYPESAFE_ENUM(Name, Derivation, Values) \
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std::string toString(Name value) \
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{ \
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switch (value) \
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{ \
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using TheEnum = Name; \
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Values(DECLARE_TYPESAFE_ENUM_HELPER2) \
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} \
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return std::string{"Unknown " #Name "("} + std::to_string(int(value)) + ')'; \
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} \
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std::optional<Name> parse##Name(std::string_view str) \
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{ \
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using TheEnum = Name; \
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if (false) {} \
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Values(DECLARE_TYPESAFE_ENUM_HELPER3) \
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return std::nullopt; \
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}
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