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#pragma once
#include <mbgl/util/optional.hpp>
#include <algorithm>
#include <cassert>
#include <string>
namespace mbgl {
template <typename T>
class Enum {
public:
using Value = std::pair<const T, const char *>;
static const char * toString(T t) {
auto it = std::find_if(begin, end, [&] (const auto& v) { return t == v.first; });
assert(it != end); return it->second;
}
static optional<T> toEnum(const std::string& s) {
auto it = std::find_if(begin, end, [&] (const auto& v) { return s == v.second; });
return it == end ? optional<T>() : it->first;
}
private:
static const Value* begin;
static const Value* end;
};
#define MBGL_DEFINE_ENUM(type, strings...) \
const constexpr Enum<type>::Value type##_names[] = strings; \
template <> const Enum<type>::Value* Enum<type>::begin = std::begin(type##_names); \
template <> const Enum<type>::Value* Enum<type>::end = std::end(type##_names)
} // namespace mbgl
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