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-rw-r--r--lib/collections.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/collections.h b/lib/collections.h
index 27eff0a..b921424 100644
--- a/lib/collections.h
+++ b/lib/collections.h
@@ -45,6 +45,7 @@ operator*(const std::array<T, first> & a, const std::array<V, second> & b)
template<typename T, std::size_t N>
[[nodiscard]] constexpr auto
operator*(const std::array<T, N> & in, auto && f)
+ requires requires { f(in.front()); }
{
std::array<decltype(f(in[0])), N> out;