https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84358
Bug ID: 84358
Summary: error message (missing call to class contructor):
misleading source code location
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: marco.morandini at polimi dot it
Target Milestone: ---
Consider the following (wrong) code:
//////////////////////////////
class A {
public:
A(int i) {};
A& operator=(const A&) = delete;
A(const A&) = delete;
};
class B {
private:
A a;
const int b;
public:
B() : b(1) {};
};
//////////////////////////////
The error message is
------------------------------------
marco@pao:~> g++ pippo.C
pippo.C: In constructor ‘B::B()’:
pippo.C:13:11: error: no matching function for call to ‘A::A()’
B() : b(1) {};
^
pippo.C:3:2: note: candidate: A::A(int)
A(int i) {};
^
pippo.C:3:2: note: candidate expects 1 argument, 0 provided
------------------------------------
I think that the indication of b(1) as the location of the error, together with
the above message ("no matching function for call to ‘A::A()’": which call?
there is not such call at the offending line!) is misleading. For a complex
code with many members stored inside B it's not obvious that the compiler is
trying to insert a call to A's constructor.
