https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112839
Bug ID: 112839
Summary: Unable to default initialize member variable in
specific circumstances
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: luigighiron at gmail dot com
Target Milestone: ---
The following code is not accepted by GCC:
struct A {
struct B {
int C = 0;
};
A() = default;
A(int) {}
std::pair<B, B> p;
};
The error message generated indicates that it was unable to find a constructor
to call in the constructor A(int).
Doing any of the following seems to remove the error:
1. Removing the constructor A()
2. Explicitly define the constructor A()
3. Defining a default constructor for B (that isn't defaulted)
4. Removing the default value from C
5. Initializing p when it is being declared, i.e. std::pair<B, B> p{};
6. Defining B outside of the class
7. Using a non-default constructor in the member initializer list
Clang, MSVC, and old versions of GCC (version 8, version 5, and version 4)
accept this code.
