Compiler Error C2059

 

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The latest version of this topic can be found at Compiler Error C2059.

syntax error : 'token'

The token caused a syntax error.

The following example generates an error message for the line that declares j.

// C2059e.cpp  
// compile with: /c  
// C2143 expected  
// Error caused by the incorrect use of '*'.  
   int j*; // C2059   

To determine the cause of the error, examine not only the line that's listed in the error message, but also the lines above it. If examining the lines yields no clue about the problem, try commenting out the line that's listed in the error message and perhaps several lines above it.

If the error message occurs on a symbol that immediately follows a typedef variable, make sure that the variable is defined in the source code.

You may get C2059 if a symbol evaluates to nothing, as can occur when /Dsymbol= is used to compile.

// C2059a.cpp  
// compile with: /DTEST=  
#include <stdio.h>  
  
int main() {  
   #ifdef TEST  
      printf_s("\nTEST defined %d", TEST);   // C2059  
   #else  
      printf_s("\nTEST not defined");  
   #endif  
}  

Another case in which C2059 can occur is when you compile an application that specifies a structure in the default arguments for a function. The default value for an argument must be an expression. An initializer list—for example, one that used to initialize a structure—is not an expression. To resolve this problem, define a constructor to perform the required initialization.

The following example generates C2059:

// C2059b.cpp  
// compile with: /c  
struct ag_type {  
   int a;  
   float b;  
   // Uncomment the following line to resolve.  
   // ag_type(int aa, float bb) : a(aa), b(bb) {}   
};  
  
void func(ag_type arg = {5, 7.0});   // C2059  
void func(ag_type arg = ag_type(5, 7.0));   // OK  

You can also get C2059 if you define a member template class or function outside the class. For information, see Knowledge Base article 241949.

C2059 can occur for an ill-formed cast.

The following sample generates C2059:

// C2059c.cpp  
// compile with: /clr  
using namespace System;  
ref class From {};  
ref class To : public From {};  
  
int main() {  
   From^ refbase = gcnew To();  
   To^ refTo = safe_cast<To^>(From^);   // C2059  
   To^ refTo2 = safe_cast<To^>(refbase);   // OK  
}  

C2059 can also occur if you attempt to create a namespace name that contains a period.

The following sample generates C2059:

// C2059d.cpp  
// compile with: /c  
namespace A.B {}   // C2059  
  
// OK  
namespace A  {  
   namespace B {}  
}  

C2059 can occur when an operator that can qualify a name (::, ->, and .) must be followed by the keyword template, as shown in this example:

template <typename T> struct Allocator {  
    template <typename U> struct Rebind {  
        typedef Allocator<U> Other;  
    };  
};  
  
template <typename X, typename AY> struct Container {  
    typedef typename AY::Rebind<X>::Other AX; // error C2059  
};  
  

By default, C++ assumes that AY::Rebind isn't a template; therefore, the following < is interpreted as a less-than sign. You must tell the compiler explicitly that Rebind is a template so that it can correctly parse the angle bracket. To correct this error, use the template keyword on the dependent type's name, as shown here:

template <typename T> struct Allocator {  
    template <typename U> struct Rebind {  
        typedef Allocator<U> Other;  
    };  
};  
  
template <typename X, typename AY> struct Container {  
    typedef typename AY::template Rebind<X>::Other AX; // correct  
};  
  

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