Programming Forums > Application Development > C++

weeb0 · Jan 25th, 2006, 9:16 PM

Hi,

I have the following class in an header file

 1: #ifndef ERROR_THROWS
 2: #define ERROR_THROWS
 3:
 4: class cserial_throws
 5: {
 6: public:
 7:	 char message_t[1024];
 8:	 int error_number;
 9: };
10:
11: #endif

when I use the definition and include the header in my project, I get the following message from the g++ compiler:

error_throws.h :9: error: multiple types in one declaration

Do somebody know what could be the problem ?

thank you!

grumpy · Jan 26th, 2006, 12:12 AM

My guess is that, before you #include this file, you have code (or #include other headers) that #define's macros or types that interact with your declaration. It could also be a sign of a missing semi-colon in that preceding code.

The missing semi-colon in preceding code is pretty high on the list, so check that first. Easily fixed, but complain bitterly to the author of that code if it's in a library header. Then check to see if the names ERROR_THROWS (not I'm not kidding), cserial_throws, message_t, or error_number are declared somewhere else. If I had to pick the most likely culprit among those it would be message_t: such a name is often used internally in some library code as a type identifer (and, IIRC, gnu provide a mailutil library than has a message_t type). Then rename things accordingly.

If all that fails to turn up something, look for definitions of C/C++ keywords (eg int) in preceding code. And complain bitterly to authors of that code: they are introducing undefined behaviour.

Jan 25th, 2006, 9:16 PM	#1
weeb0 Newbie Join Date: Jan 2006 Posts: 17 Rep Power: 0	multiple types in one declaration ????? Hi, I have the following class in an header file (Toggle Plain Text) 1: #ifndef ERROR_THROWS 2: #define ERROR_THROWS 3: 4: class cserial_throws 5: { 6: public: 7: char message_t[1024]; 8: int error_number; 9: }; 10: 11: #endif 1: #ifndef ERROR_THROWS 2: #define ERROR_THROWS 3: 4: class cserial_throws 5: { 6: public: 7: char message_t[1024]; 8: int error_number; 9: }; 10: 11: #endif when I use the definition and include the header in my project, I get the following message from the g++ compiler: error_throws.h :9: error: multiple types in one declaration Do somebody know what could be the problem ? thank you!

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Jan 26th, 2006, 12:12 AM	#2
grumpy Programming Guru Join Date: Jun 2005 Location: Adelaide, South Australia Posts: 1,223 Rep Power: 5	My guess is that, before you #include this file, you have code (or #include other headers) that #define's macros or types that interact with your declaration. It could also be a sign of a missing semi-colon in that preceding code. The missing semi-colon in preceding code is pretty high on the list, so check that first. Easily fixed, but complain bitterly to the author of that code if it's in a library header. Then check to see if the names ERROR_THROWS (not I'm not kidding), cserial_throws, message_t, or error_number are declared somewhere else. If I had to pick the most likely culprit among those it would be message_t: such a name is often used internally in some library code as a type identifer (and, IIRC, gnu provide a mailutil library than has a message_t type). Then rename things accordingly. If all that fails to turn up something, look for definitions of C/C++ keywords (eg int) in preceding code. And complain bitterly to authors of that code: they are introducing undefined behaviour.

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Programming Forums > Application Development > C++

multiple types in one declaration ?????