| CDT code analysis C++ error markers for sizeof and va_list [message #1795342] |
Thu, 20 September 2018 15:03  |
 Mark Cooper
Messages: 1
Registered: September 2018 |
Junior Member |
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I am seeing a couple error markers being displayed only for C++ files by Eclipse CDT that I am not sure are desireable. Here are some examples:
1) When sizeof passed as an argument to another function, something that is done often, I am seeing CDT complain about the type returned. Here's an example:
memset(handle,0,sizeof(handle));
CDT complains because the prototype we have defined is
extern void *memset (void *__s, int __c, size_t __n) __THROW;
CDT error:
Invalid arguments 'Candidates are: void * memset(void *, int, unsigned long int)'
Size_t is defined as follows: typedef unsigned long size_t;
I assume I see the error because sizeof in C++ returns a std::size_t. Of course I have a way around this (can cast the result of sizeof()), but wonder if this is the intended behavior.
2) va_list, va_start and va_end could not be resolved. Here's one error:
CDT error:
Type 'va_list' could not be resolved
Anything defined with va_list will consequently give an error:
my code:
vsnprintf(buffer,255,fmt,arg);
CDT error:
Invalid arguments 'Candidates are: int vsnprintf(char *, unsigned long int, const char *, ?)'
Thanks for any input,
Mark
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| Re: CDT code analysis C++ error markers for sizeof and va_list [message #1795363 is a reply to message #1795342] |
Fri, 21 September 2018 01:15  |
David Vavra
Messages: 1426
Registered: October 2012 |
Senior Member |
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These don't seem to have much to do with CDT.
1) I defined a function MEMSET similar to yours.
What is the declaration of handle used in your call: memset(handle,0,sizeof(handle)) ?
if it isn't a pointer then the call is incorrect.
The following works:
#include <cstddef> // for size_t
void * MEMSET(void *__s, int __c, size_t __n);
int handle;
MEMSET(&handle,0,sizeof(handle));
int HAND[5];
MEMSET(HAND,0,sizeof(HAND));
The above also work when I declare:
typedef unsigned long int SIZE_T;
void * MEMSET(void *__s, int __c, SIZE_T __n);
2) va_list is defined in <cstdarg>
Did you include it?
The following worked for me:
#include <cstdarg> // for va_list
#include <cstdio> // for vsnprintf
char buff[256];
char * fmt;
va_list arg;
vsnprintf(buff, sizeof(buff)-1, fmt, arg);
[Updated on: Fri, 21 September 2018 03:28] Report message to a moderator |
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