Mastodawn

Can we fix the following inconsistency in #CPlusPlus: https://compiler-explorer.com/z/qsYeTncE4? A conversion operator is sufficient to call wrapped function pointers. But it does not work for wrapped callable objects. And that's even though `wrapper` in the above example has the callable type in its associated namespaces (ADL). ADL was introduced to make operators work. I patched my #GCC to make it work and I like it.

#WG21 #cpp29 #cpp

Compiler Explorer - C++ (x86-64 gcc (trunk))

template <typename T> struct wrapper { T value; constexpr operator const T&() const { return value; } #if 0 constexpr decltype(auto) operator()(auto&&... args) { return value(args...); } #endif }; int f1(int); auto f2 = [](int x) { return f1(x); }; int test1() { return wrapper{f1}(1); } int test2() { return wrapper{f2}(1); }

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Dani (

Antifascista)Oct 31

@mkretz
"We violently agree" 😸

But P3802 will certainly have to wait until #cpp29 to become a portable C++ feature for apparent procedural reasons: it appeared *after* #cpp26 feature freeze, was never discussed in EWG, nor made it into a plenary vote. AFAICS, the mistake of #cpp0x will not be made again.