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[core] Avoid -Wundefined-var-template warnings with clang 3.9+

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This commit is contained in:
John Firebaugh
2017-03-09 15:10:24 -08:00
parent f169577aab
commit 348cffa119
1 changed files with 19 additions and 19 deletions
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38
include/mbgl/util/enum.hpp
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@@ -11,26 +11,26 @@ 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;
static const char * toString(T);
static optional<T> toEnum(const std::string&);
};
#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)
#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