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#define COMPARE(T) \
  int compare(const T s) \
  { \
    int c = compare(s.GetString()); \
    return c; \
  }
 
COMPARE(CStringA)
COMPARE(CStringW)
 
#undef COMPARE
 
 
#define COMPARE(T) \
  int compare(const T s) \
  { \
    int c = compare(s.c_str()); \
    return c; \
  }
 
COMPARE(std::string)
COMPARE(std::wstring)
 
#undef COMPARE
 

prog.cpp:8:9: error: 'CStringA' does not name a type
 COMPARE(CStringA)
         ^
prog.cpp:2:21: note: in definition of macro 'COMPARE'
   int compare(const T s) \
                     ^
prog.cpp: In function 'int compare(int)':
prog.cpp:4:23: error: request for member 'GetString' in 's', which is of non-class type 'const int'
     int c = compare(s.GetString()); \
                       ^
prog.cpp:8:1: note: in expansion of macro 'COMPARE'
 COMPARE(CStringA)
 ^
prog.cpp: At global scope:
prog.cpp:9:9: error: 'CStringW' does not name a type
 COMPARE(CStringW)
         ^
prog.cpp:2:21: note: in definition of macro 'COMPARE'
   int compare(const T s) \
                     ^
prog.cpp: In function 'int compare(int)':
prog.cpp:2:7: error: redefinition of 'int compare(int)'
   int compare(const T s) \
       ^
prog.cpp:9:1: note: in expansion of macro 'COMPARE'
 COMPARE(CStringW)
 ^
prog.cpp:2:7: note: 'int compare(int)' previously defined here
   int compare(const T s) \
       ^
prog.cpp:8:1: note: in expansion of macro 'COMPARE'
 COMPARE(CStringA)
 ^
prog.cpp:4:23: error: request for member 'GetString' in 's', which is of non-class type 'const int'
     int c = compare(s.GetString()); \
                       ^
prog.cpp:9:1: note: in expansion of macro 'COMPARE'
 COMPARE(CStringW)
 ^
prog.cpp: At global scope:
prog.cpp:21:14: error: 'string' in namespace 'std' does not name a type
 COMPARE(std::string)
              ^
prog.cpp:15:21: note: in definition of macro 'COMPARE'
   int compare(const T s) \
                     ^
prog.cpp: In function 'int compare(int)':
prog.cpp:15:7: error: redefinition of 'int compare(int)'
   int compare(const T s) \
       ^
prog.cpp:21:1: note: in expansion of macro 'COMPARE'
 COMPARE(std::string)
 ^
prog.cpp:2:7: note: 'int compare(int)' previously defined here
   int compare(const T s) \
       ^
prog.cpp:8:1: note: in expansion of macro 'COMPARE'
 COMPARE(CStringA)
 ^
prog.cpp:17:23: error: request for member 'c_str' in 's', which is of non-class type 'const int'
     int c = compare(s.c_str()); \
                       ^
prog.cpp:21:1: note: in expansion of macro 'COMPARE'
 COMPARE(std::string)
 ^
prog.cpp: At global scope:
prog.cpp:22:14: error: 'wstring' in namespace 'std' does not name a type
 COMPARE(std::wstring)
              ^
prog.cpp:15:21: note: in definition of macro 'COMPARE'
   int compare(const T s) \
                     ^
prog.cpp: In function 'int compare(int)':
prog.cpp:15:7: error: redefinition of 'int compare(int)'
   int compare(const T s) \
       ^
prog.cpp:22:1: note: in expansion of macro 'COMPARE'
 COMPARE(std::wstring)
 ^
prog.cpp:2:7: note: 'int compare(int)' previously defined here
   int compare(const T s) \
       ^
prog.cpp:8:1: note: in expansion of macro 'COMPARE'
 COMPARE(CStringA)
 ^
prog.cpp:17:23: error: request for member 'c_str' in 's', which is of non-class type 'const int'
     int c = compare(s.c_str()); \
                       ^
prog.cpp:22:1: note: in expansion of macro 'COMPARE'
 COMPARE(std::wstring)
 ^

Standard output is empty