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add tuple_size to camp::array #194

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add tuple_size to camp::array #194

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5 changes: 5 additions & 0 deletions include/camp/tuple.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
#include <sstream>
#include <type_traits>

#include "camp/array.hpp"
#include "camp/concepts.hpp"
#include "camp/map.hpp"

Expand Down Expand Up @@ -52,6 +53,10 @@ template <typename... Args>
struct tuple_size<tuple<Args...>> : ::camp::num<sizeof...(Args)> {
};

template <typename T, size_t N>
struct tuple_size<array<T, N>> : ::camp::num<N> {
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@adayton1 adayton1 Mar 4, 2026

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There's already a tuple_size entity in array.hpp. Does that one not work?

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@gberg617 gberg617 Mar 5, 2026

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That one does not work for me because it's defined within the std namespace. camp::apply looks for camp::tuple_size, so we need to define one that specializes for camp::array.

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@adayton1 adayton1 Mar 5, 2026

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Can you move this one to array.hpp, then?

};

template <typename L, typename... Args>
struct tuple_size<tagged_tuple<L, Args...>> : ::camp::num<sizeof...(Args)> {
};
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