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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:
static const char * toString(T);
static optional<T> toEnum(const std::string&);
};
#define MBGL_DEFINE_ENUM(T, values...) \
\
static const constexpr std::pair<const T, const char *> T##_names[] = values; \
\
template <> \
const char * Enum<T>::toString(T t) { \
auto it = std::find_if(std::begin(T##_names), std::end(T##_names), \
[&] (const auto& v) { return t == v.first; }); \
assert(it != std::end(T##_names)); return it->second; \
} \
\
template <> \
optional<T> Enum<T>::toEnum(const std::string& s) { \
auto it = std::find_if(std::begin(T##_names), std::end(T##_names), \
[&] (const auto& v) { return s == v.second; }); \
return it == std::end(T##_names) ? optional<T>() : it->first; \
}
} // namespace mbgl
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