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-rw-r--r--lib/collections.hpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/collections.hpp b/lib/collections.hpp
index 4df622e..b51d18e 100644
--- a/lib/collections.hpp
+++ b/lib/collections.hpp
@@ -70,6 +70,9 @@ template<template<typename...> typename C, typename... T>
operator*(const C<T...> & in, auto && f)
{
C<decltype(f(*in.begin()))> out;
+ if constexpr (requires { out.reserve(in.size()); }) {
+ out.reserve(in.size());
+ }
std::transform(in.begin(), in.end(), std::inserter(out, out.end()), f);
return out;