Compiler Error C2758

'member': a member of reference type must be initialized

Compiler error C2758 is caused when the constructor does not initialize a member of reference type in an initializer list. The compiler leaves the member undefined. Reference member variables must initialized when declared or be given a value in the initialization list of the constructor.

The following sample generates C2758:

// C2758.cpp
// Compile by using: cl /W3 /c C2758.cpp
struct A {
   const int i;

   A(int n) { };   // C2758
   // try the following line instead
   // A(int n) : i{n} {};
};