Solving the "use of undefined type" in C++
1473
When can I use a forward declaration?
73291
How to use a member variable as a default argument in C++?
16122
Is it possible to pass a type and a pointer of that type to a c++ template class using a single parameter of a template class?
10445
pointer increment and dereference (lvalue required error)
29761
"Undefined reference to" template class constructor
52916
Why am I getting "undefined reference to sqrt" error even though I include math.h header?
47316
C++ template function for arrays, vectors, built in types, STL
136242
Undefined Reference to a function
68099
Undeclared identifier but is declared
82611
c++: when to use pointers?
6292
What is an undefined reference/unresolved external symbol error and how do I fix it?
35583
How do you properly use namespaces in C++?
76068
What is the difference between 'typedef' and 'using' in C++11?
619
Why are these constructs using pre and post-increment undefined behavior?
90868
"Error: Unresolved external symbol" whenever I use a pure virtual function
42432
"invalid use of incomplete type" error with partial template specialization
44265
What's the scope of the "using" declaration in C++?