Pointer problem | Member | | Join Date: Nov 2006 Location: Houston, Texas
Posts: 46
| | |
Trying to load a vector, I got the following messages:
| | Member | | Join Date: Nov 2006 Location: Houston, Texas
Posts: 46
| | | re: Pointer problem
d:/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/bits/stl_algobase.h:247: error: no match for 'operator*' in '*__result'
| | Member | | Join Date: Nov 2006 Location: Houston, Texas
Posts: 46
| | | re: Pointer problem
d:/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/c++/3.4.5/bits/stl_algobase.h:249: error: no match for 'operator++' in '++__result'
| | Member | | Join Date: Nov 2006 Location: Houston, Texas
Posts: 46
| | | re: Pointer problem
Here is the WindDataReceiveBuffer header:
| | Member | | Join Date: Nov 2006 Location: Houston, Texas
Posts: 46
| | | re: Pointer problem
- #ifndef WINDDATARECEIVEBUFFER_H_
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#define WINDDATARECEIVEBUFFER_H_
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#include "windsTableElement.h"
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#include <vector>
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typedef std::vector< WindsTableElement > WindTable;
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WindTable wt_;
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class WindDataReceiveBuffer
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{
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static WindDataReceiveBuffer* instance_;
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protected:
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WindDataReceiveBuffer();
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~WindDataReceiveBuffer();
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WindDataReceiveBuffer(const WindDataReceiveBuffer&);
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WindDataReceiveBuffer& operator=(const WindDataReceiveBuffer&);
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public:
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static WindDataReceiveBuffer* Instance();
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void setData(char*, unsigned int);
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WindTable getWindTable();
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};
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#endif /*WINDDATARECEIVEBUFFER_H_*/
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| | Member | | Join Date: Nov 2006 Location: Houston, Texas
Posts: 46
| | | re: Pointer problem
And the implementation code: - #include <iostream>
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#include "WindDataReceiveBuffer.h"
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WindDataReceiveBuffer* WindDataReceiveBuffer::instance_ = 0;
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WindDataReceiveBuffer* WindDataReceiveBuffer::Instance()
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{
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if (instance_ == 0)
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{
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instance_ = new WindDataReceiveBuffer;
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}
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return instance_;
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}
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| | Member | | Join Date: Nov 2006 Location: Houston, Texas
Posts: 46
| | | re: Pointer problem
- WindDataReceiveBuffer::WindDataReceiveBuffer()
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{
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}
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WindDataReceiveBuffer::~WindDataReceiveBuffer()
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{
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}
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void WindDataReceiveBuffer::setData(char* inBufr,
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unsigned int size)
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{
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std::copy(inBufr, inBufr+(size * sizeof(WindsTableElement)), wt_);
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}
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WindTable WindDataReceiveBuffer::getWindTable()
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{
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return wt_;
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}
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|  | Moderator | | Join Date: Oct 2006 Location: New York, United States of America
Posts: 3,428
| | | re: Pointer problem
Quote:
Originally Posted by PaperPilot And the implementation code:
- #include <iostream>
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#include "WindDataReceiveBuffer.h"
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WindDataReceiveBuffer* WindDataReceiveBuffer::instance_ = 0;
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WindDataReceiveBuffer* WindDataReceiveBuffer::Instance()
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{
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if (instance_ == 0)
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{
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instance_ = new WindDataReceiveBuffer;
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}
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return instance_;
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}
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When you define instance_ for the first time (your first line of code here), don't include the WindDataReceiveBuffer* before the WindDataRetrieveBuffer::instance_ declaration. Including this makes it seem like a function which would be returning a variable of type WindDataReceiveBuffer*, which works for your Instance() function, but not a static variable declaration.
| | Member | | Join Date: Nov 2006 Location: Houston, Texas
Posts: 46
| | | re: Pointer problem
It seems I need to overload the operators ++ and * for the pointer __result.
Can you help?
(Sorry for using so many posts, but it is the only way I could get all the code in.
Refer to the "Incrementing a pointer" thread for the windsTableElement class code.)
| | Member | | Join Date: Dec 2006
Posts: 38
| | | re: Pointer problem
the third argument to std::copy must be an output iterator, not an object. So, you can use a pointer, or an actual iterator class, etc. Refer to the std::copy documentation for more info.
| | Member | | Join Date: Nov 2006 Location: Houston, Texas
Posts: 46
| | | re: Pointer problem
Quote:
Originally Posted by Ganon11 When you define instance_ for the first time (your first line of code here), don't include the WindDataReceiveBuffer* before the WindDataRetrieveBuffer::instance_ declaration. Including this makes it seem like a function which would be returning a variable of type WindDataReceiveBuffer*, which works for your Instance() function, but not a static variable declaration. The static member variable instance_ contains a pointer to an instantiation of WindDataReceiveBuffer, making sure using routines can only construct one of them.
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