Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Compiler Warning (level 4) C4913
Collapse the table of content
Expand the table of content

Compiler Warning (level 4) C4913

user defined binary operator ',' exists but no overload could convert all operands, default built-in binary operator ',' used

A call to the built-in comma operator occurred in a program that also had an overloaded comma operator; a conversion that you thought may have occurred did not.

The following code sample generates C4913:

// C4913.cpp
// compile with: /W4
struct A

struct S

struct B
   // B() { }
   // B(S &s) { s; }

B operator , (A a, B b)   
   return b;

int main()
   A a;
   B b;
   S s;

   a, b;   // OK calls user defined operator
   a, s;   // C4913 uses builtin comma operator
           // uncomment the conversion code in B to resolve.
© 2015 Microsoft