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From: "omer.rosler at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/99683] Deduction failure when using CTAD of CNTTP inside a deduction guide
Date: Thu, 15 Apr 2021 17:48:52 +0000	[thread overview]
Message-ID: <bug-99683-4-7cV1PVqBfQ@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-99683-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99683

--- Comment #1 from Omer Rosler <omer.rosler at gmail dot com> ---
It seems that 

Reduced:

template<typename>
struct A
{
    constexpr A(int) {}
};

A(int) -> A<int>;


template<A> //template<auto> works fine
struct B 
{
    template<typename T>
    B(T);
};

template<typename T>
B(T) -> B<A{T{}}>; //see below


int main()
{
    B t(42);
}


specifying A<T> explicitly also works, it's the deduction that triggers the bug

If the initializer of `A` is not dependent on the template parameter of the
guide (i.e `T`) than the bug isn't showing

  reply	other threads:[~2021-04-15 17:48 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-20 17:27 [Bug c++/99683] New: " omer.rosler at gmail dot com
2021-04-15 17:48 ` omer.rosler at gmail dot com [this message]
2021-04-15 18:56 ` [Bug c++/99683] " ppalka at gcc dot gnu.org
2021-04-24  4:15 ` cvs-commit at gcc dot gnu.org
2021-04-27 21:24 ` cvs-commit at gcc dot gnu.org
2021-05-01 18:47 ` ppalka at gcc dot gnu.org

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