diff options
| -rw-r--r-- | lib/collections.hpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/collections.hpp b/lib/collections.hpp index 59cec6f..4df622e 100644 --- a/lib/collections.hpp +++ b/lib/collections.hpp @@ -65,10 +65,11 @@ operator*=(IterableCollection auto & in, auto && f) } template<template<typename...> typename C, typename... T> + requires IterableCollection<C<T...>> [[nodiscard]] constexpr auto operator*(const C<T...> & in, auto && f) { - C<decltype(f(in[0]))> out; + C<decltype(f(*in.begin()))> out; std::transform(in.begin(), in.end(), std::inserter(out, out.end()), f); return out; |