Question

My question is about the new C++11 feature Delegating Constructors. So I have two similar ctors in my class and I would like to simplify their implementation. The problem that they both have structures as a parameter and when I tried to delegate them, a compiler error occured:

error: type ‘MyClass’ is not a direct base of ‘MyClass’

So here is before:

MyClass::MyClass ( const timeval & TV ) :
      Seconds ( TV.tv_sec),
      USeconds ( TV.tv_usec ),
{
}

MyClass::MyClass ( const timespec & TS ) :
        Seconds ( TS.tv_sec),
        USeconds ( TS.tv_nsec * 1000 ),
{
}

After:

MyClass::MyClass ( const timeval & TV ) :
      MyClass ( timeval { TV.tv_sec, TV.tv_usec/1000 } )
{
}

MyClass::MyClass ( const timespec & TS ) :
        Seconds ( TS.tv_sec),
        USeconds ( TS.tv_nsec * 1000 ),
{
}

Does anybody know how can I call the second ctor from the first one correctly?

Answer 1

Besides the obvious error (you are trying to delegate to the same constructor) the code is correct and should work on g++4.7

MyClass::MyClass ( const timeval & TV ) :
      MyClass ( timespec { TV.tv_sec, TV.tv_usec/1000 } )
{
}

MyClass::MyClass ( const timespec & TS ) :
        Seconds ( TS.tv_sec),
        USeconds ( TS.tv_nsec * 1000 ),
{
}

It might be an issue with your compiler/version.