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C++14 has one of these in the standard library (nw)

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This commit is contained in:
Vas Crabb 2018-06-01 13:07:01 +10:00
parent aebae021bf
commit d96189dfc9
1 changed files with 4 additions and 9 deletions
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13
src/emu/devfind.h
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@ -38,20 +38,15 @@ template <typename T, unsigned Count>
class object_array_finder class object_array_finder
{ {
private: private:
template <unsigned... V> struct indices { };
template <unsigned C, unsigned... V> struct range : public range<C - 1, C - 1, V...> { };
template <unsigned... V> struct range<0U, V...> { typedef indices<V...> type; };
template <unsigned C> using index_range = typename range<C>::type;
template <typename F, typename... Param, unsigned... V> template <typename F, typename... Param, unsigned... V>
object_array_finder(device_t &base, F const &fmt, unsigned start, indices<V...>, Param const &... arg) object_array_finder(device_t &base, F const &fmt, unsigned start, std::integer_sequence<unsigned, V...>, Param const &... arg)
: m_tag{ util::string_format(fmt, start + V)... } : m_tag{ util::string_format(fmt, start + V)... }
, m_array{ { base, m_tag[V].c_str(), arg... }... } , m_array{ { base, m_tag[V].c_str(), arg... }... }
{ {
} }
template <typename... Param, unsigned... V> template <typename... Param, unsigned... V>
object_array_finder(device_t &base, std::array<char const *, Count> const &tags, indices<V...>, Param const &... arg) object_array_finder(device_t &base, std::array<char const *, Count> const &tags, std::integer_sequence<unsigned, V...>, Param const &... arg)
: m_array{ { base, tags[V], arg... }... } : m_array{ { base, tags[V], arg... }... }
{ {
} }
@ -110,7 +105,7 @@ public:
/// \sa util::string_format /// \sa util::string_format
template <typename F, typename... Param> template <typename F, typename... Param>
object_array_finder(device_t &base, F const &fmt, unsigned start, Param const &... arg) object_array_finder(device_t &base, F const &fmt, unsigned start, Param const &... arg)
: object_array_finder(base, fmt, start, index_range<Count>(), arg...) : object_array_finder(base, fmt, start, std::make_integer_sequence<unsigned, Count>(), arg...)
{ {
} }
@ -126,7 +121,7 @@ public:
/// all elements. /// all elements.
template <typename... Param> template <typename... Param>
object_array_finder(device_t &base, std::array<char const *, Count> const &tags, Param const &... arg) object_array_finder(device_t &base, std::array<char const *, Count> const &tags, Param const &... arg)
: object_array_finder(base, tags, index_range<Count>(), arg...) : object_array_finder(base, tags, std::make_integer_sequence<unsigned, Count>(), arg...)
{ {
} }