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Compiler Error C2133

  • Article

'identifier' : unknown size

An unsized array is declared as a member of a class, structure, union, or enumeration. The /Za (ANSI C) option does not allow unsized member arrays.

The following sample generates C2133:

// C2133.cpp
// compile with: /Za
struct X {
   int a[0];   // C2133 unsized array
};

Possible resolution:

// C2133b.cpp
// compile with: /c
struct X {
   int a[0];   // no /Za
};