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Move constexpr_first/last to common.h
This keeps it with constexpr_sum and the other metafunctions.
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@ -1314,25 +1314,6 @@ private:
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std::tuple<make_caster<Args>...> value;
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};
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NAMESPACE_BEGIN(constexpr_impl)
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/// Implementation details for constexpr functions
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constexpr int first(int i) { return i; }
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template <typename T, typename... Ts>
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constexpr int first(int i, T v, Ts... vs) { return v ? i : first(i + 1, vs...); }
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constexpr int last(int /*i*/, int result) { return result; }
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template <typename T, typename... Ts>
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constexpr int last(int i, int result, T v, Ts... vs) { return last(i + 1, v ? i : result, vs...); }
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NAMESPACE_END(constexpr_impl)
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/// Return the index of the first type in Ts which satisfies Predicate<T>
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template <template<typename> class Predicate, typename... Ts>
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constexpr int constexpr_first() { return constexpr_impl::first(0, Predicate<Ts>::value...); }
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/// Return the index of the last type in Ts which satisfies Predicate<T>
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template <template<typename> class Predicate, typename... Ts>
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constexpr int constexpr_last() { return constexpr_impl::last(0, -1, Predicate<Ts>::value...); }
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/// Helper class which collects only positional arguments for a Python function call.
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/// A fancier version below can collect any argument, but this one is optimal for simple calls.
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template <return_value_policy policy>
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@ -449,6 +449,26 @@ constexpr size_t constexpr_sum() { return 0; }
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template <typename T, typename... Ts>
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constexpr size_t constexpr_sum(T n, Ts... ns) { return size_t{n} + constexpr_sum(ns...); }
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NAMESPACE_BEGIN(constexpr_impl)
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/// Implementation details for constexpr functions
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constexpr int first(int i) { return i; }
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template <typename T, typename... Ts>
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constexpr int first(int i, T v, Ts... vs) { return v ? i : first(i + 1, vs...); }
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constexpr int last(int /*i*/, int result) { return result; }
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template <typename T, typename... Ts>
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constexpr int last(int i, int result, T v, Ts... vs) { return last(i + 1, v ? i : result, vs...); }
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NAMESPACE_END(constexpr_impl)
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/// Return the index of the first type in Ts which satisfies Predicate<T>. Returns sizeof...(Ts) if
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/// none match.
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template <template<typename> class Predicate, typename... Ts>
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constexpr int constexpr_first() { return constexpr_impl::first(0, Predicate<Ts>::value...); }
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/// Return the index of the last type in Ts which satisfies Predicate<T>, or -1 if none match.
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template <template<typename> class Predicate, typename... Ts>
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constexpr int constexpr_last() { return constexpr_impl::last(0, -1, Predicate<Ts>::value...); }
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// Extracts the first type from the template parameter pack matching the predicate, or Default if none match.
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template <template<class> class Predicate, class Default, class... Ts> struct first_of;
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template <template<class> class Predicate, class Default> struct first_of<Predicate, Default> {
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