From 1df19efd78b5f61b89b953d133baf1a5ccf963dd Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Tue, 4 Mar 2025 20:27:12 +0000
Subject: Constrain operator* for array*functor

Stops it being a broken candidate for array*array
---
 lib/collections.h | 1 +
 1 file changed, 1 insertion(+)

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;
 
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