Can template args be member fn calls of fn params?

Programming
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1

Is the Following Syntax Valid?

The following syntax:

#include <type_traits>

template<class T>
auto f(T x) -> std::enable_if_t<x.size() == 4>;

is valid for Clang and MSVC but invalid according to GCC. See this Godbolt link to compare the results between compilers.

2

No, the following syntax is not valid for all compilers. It is valid for Clang and MSVC, but invalid for GCC.