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concepts: disable tuple_element test for tuple

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This commit is contained in:
Danny Robson 2020-02-25 11:23:50 +11:00
parent 61cc9b9ed2
commit 40694c4138
1 changed files with 3 additions and 1 deletions
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4
concepts.hpp
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@ -285,7 +285,9 @@ namespace cruft::concepts {
template <typename T>
concept tuple = requires (T a, T b)
{
{ std::tuple_size<T>::value == 0 || std::tuple_element<0,T> {} };
// We should be checking this, but it fails for zero length tuples and
// it's kind of a low priority right now.
// { std::tuple_element<0,T> {} };
{ std::tuple_size<T>::value } -> convertible_to<std::size_t>;
{ std::tuple_cat (a, b) };
};