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View Code? Open in Web Editor NEWA C++20 concepts library, providing container concepts etc.
License: MIT License
A C++20 concepts library, providing container concepts etc.
License: MIT License
I'm calling a constrained function from within a const
member function, so the container is being marked const
, and subsequently fails the concept check because a const vector is apparently not a container (because it's not moveable).
Ignore - this turns out to be misleading diagnostics, the actual problem was I was passing the const container to a non-const ref, however it was showing up as a concept fail.
base_concepts line 51 fails to compile with "unexpanded parameter pack":
requires(Signatures& ... signatures)
{
([] <typename Ret, typename... Args>(auto(&)(Args...) -> Ret)
requires std::is_invocable_r_v<Ret, Fn, Args>
{}(signatures), ...);
};
It should be this (like the same thing at line 64):
requires std::is_invocable_r_v<Ret, Fn, Args...>
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