282e626ac1
Rewrite enum.hpp in such a way that parseConstant can be defined generically for all enumerated types. While there, properly validated enumerated property values.
37 lines
975 B
C++
37 lines
975 B
C++
#pragma once
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#include <mbgl/util/optional.hpp>
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#include <algorithm>
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#include <cassert>
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#include <string>
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namespace mbgl {
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template <typename T>
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class Enum {
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public:
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using Value = std::pair<const T, const char *>;
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static const char * toString(T t) {
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auto it = std::find_if(begin, end, [&] (const auto& v) { return t == v.first; });
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assert(it != end); return it->second;
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}
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static optional<T> toEnum(const std::string& s) {
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auto it = std::find_if(begin, end, [&] (const auto& v) { return s == v.second; });
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return it == end ? optional<T>() : it->first;
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}
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private:
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static const Value* begin;
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static const Value* end;
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};
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#define MBGL_DEFINE_ENUM(type, strings...) \
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const constexpr Enum<type>::Value type##_names[] = strings; \
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template <> const Enum<type>::Value* Enum<type>::begin = std::begin(type##_names); \
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template <> const Enum<type>::Value* Enum<type>::end = std::end(type##_names)
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} // namespace mbgl
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