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Hi,
I created a template class, just like:
template < typename TYPE, typename TYPE_ARG = TYPE > class DataList
{
public:
void AddNode( TYPE_ARG val_i )
{
SetVal( val_i, valNew );
}
protected:
struct NODE
{
NODE* pNext;
TYPE val;
};
virtual void SetVal( TYPE_ARG valSrc_i, TYPE& valDst_o )
{
val = val_i;
}
};
This is only a model. I use this class for a general purpose linked list.
I derived a class for string handling, just like:
class StringDataList : public DataList < LPTSTR, LPCTSTR >
{
private:
void SetVal( LPCTSTR valSrc_i, LPTSTR& valDst_o )
{
valDst_o = new TCHAR[ lstrlen( valSrc_i ) ];
lstrcpy( valDst_o, valSrc_i );
}
};
Thus I can use the template class for both numeric data handling and string handling.
For example:
DataList < int, int > intDataList;
StringDataList strDataList;
The real problem is, we assume that the input parameters should be const, especially for pointers (that's why I use LPCTSTR as TYPE_ARG in StringDataList).
So the compiler shows error in the base class while compiling StringDataList.
The error is error C2440: '=' : cannot convert from 'const char *' to 'char *'
If I change the TYPE_ARG to TYPE in the SetVal of template class, another problem arises. That is in the AddNode. It is written as to pass the const input value to the SetVal. To clear it, I have to change the input from TYPE_ARG to TYPE. It is OK for all the classes passing value, but for string type, it is not advisable.
One solution is, I think, use type cast in SetVal, just like
val = TYPE( val_i )
Is there any other better solution?
Thank you.
- NS -
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I think we had a discussion on constant string
when u had put up a question before few days.
I have already lost that data but will try again
for the same
but the changes u have done in the class are
quiet good.
Pls put up ur class on codeproj when u acomplish it
Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com
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Hi
Is the GUID of a COM object unique through out the network or unique through out the world
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Theoretically, it's unique, as they call it, 'both in time and in space', but it depends on the actual algorithm used to generate UUIDs. However, you can be reasonably confident that these are unique.
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I have code like this:
<br />
BOOL f() {<br />
...<br />
__try {<br />
...<br />
}__except(EXCEPTION_EXECUTE_HANDLER)<br />
{<br />
...<br />
}<br />
<br />
Object o;<br />
}<br />
The object declaration of variable 'o' is outside the __try/__except construct. I get the error:
warning C4509: nonstandard extension used: 'f' uses SEH and 'o' has destructor
Why is this so? I was thinking this should not be an issue as even if an exception is thrown, it will be handled by the __except block, and the exception stuff would end there. The object o is then created.
What can I do to fix this error?
thanks!
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firstly, it is not an error, it is a warning. that means that the compiler saw that there is some coude that may cause some trouble, but non blocking for the execution of the program.
i have one question however. why are you using __try/__except instead of try/catch ?
refering to the MSDN[^], you have to declare o before the exception handling... (SEH means structured exception handling).
TOXCCT >>> GEII power
[toxcct][VisualCalc 2.20][VisualCalc 3.0]
-- modified at 4:56 Tuesday 27th December, 2005
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I am writing a C/C++ code using EXPAT parser which convert a text file to XML file. Can someone pls let me know how to go about, sample application is appreciated? 
Anil
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I have a question?
Are static members automatically removed from the HEAP or do we have to remove it manually.
Thanks.
Happy christmas friends. May the Love of My Lord and Saviour Jesus bring forth Joy and Happiness into your life too.
<marquee direction="up" height="50" scrolldelay="1" step="1" scrollamount="1" hspace="2" vspace="2">
--Owner Drawn
--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord
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I think your question is invalid.
Static members are never allocated on heap.
Vipin - MVP
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Is there any good article on net
for the allocation for memory .
regarding diffrent variables and fuctions .
thank u
Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com
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asdfkjsodifuweior wrote: Static members are never allocated on heap.
Then where are they allocated buddy. Tell me.
Happy christmas friends. May the Love of My Lord and Saviour Jesus bring forth Joy and Happiness into your life too.
<marquee direction="up" height="50" scrolldelay="1" step="1" scrollamount="1" hspace="2" vspace="2">
--Owner Drawn
--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord
-- modified at 0:58 Tuesday 27th December, 2005
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JIANG, Sheng[MVP] wrote: on the stack.
Happy christmas friends. May the Love of My Lord and Saviour Jesus bring forth Joy and Happiness into your life too.
<marquee direction="up" height="50" scrolldelay="1" step="1" scrollamount="1" hspace="2" vspace="2">
--Owner Drawn
--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord
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JIANG, Sheng[MVP] wrote: depends on the compiler
Thanks for that.
But now if it is allocated on the HEAP do we have to do the cleaning by ourselves.
Happy christmas friends. May the Love of My Lord and Saviour Jesus bring forth Joy and Happiness into your life too.
<marquee direction="up" height="50" scrolldelay="1" step="1" scrollamount="1" hspace="2" vspace="2">
--Owner Drawn
--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord
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No. It won't be allocated on the heap.
My blogs:
http://blog.joycode.com/jiangsheng
http://blog.csdn.net/jiangsheng
http://bloglines.com/public/jiangsheng
Command what is yours
Conquer what is not
---Kane
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Static variables are in the read/write data segment when the loader loads the binary.
Info as to how much the size is, is embedded in the binary at link time.
Vipin -MVP
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Owner drawn wrote: But now if it is allocated on the HEAP do we have to do the cleaning by ourselves.
static variables are not allocated on the heap, so u dont free them. simple rule is that, what u dont allocated u dont have to free it.
Typically a binary is divided into sections, also called as the segments.
data segment
code segment &
stack segment.
so your application may have additional data segment for static data also which are typicaly a read/write segment.
Constant data are stored in read only segment.
All these segments are calculated at link time. i.e. the memory is allocated statically and not dynamically so u dont have to clean up anything.
Prakash
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I have defined a hooker procedure which is named MyProc;when receriving messages this can be invoked,but i can't step into it for debugging,the breakpoints within it seemed invalid.
Why can't i step into the hooker?thank u
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1. Set the DLL project as the active project
2. Insert some breakpoints
3. In the menu, Project / Settings / Debug, use an exe File as the debug session
4. Click OK
Now you can start debugging by pressing F5.
Note: you can only debug a process at a time.
you can also write your debug log to file.
My blogs:
http://blog.joycode.com/jiangsheng
http://blog.csdn.net/jiangsheng
http://bloglines.com/public/jiangsheng
Command what is yours
Conquer what is not
---Kane
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Vincent_Fish wrote: step into the hooker?
"But your mind is very complex, very tricky. It makes simple things complicated. -- that's its work. And for centuries it has been trained for only one thing: to make things so complicated that your life becomes impossible."- Osho
<marquee scrollamount="1" scrolldelay="1" direction="up" height="10" step="1">--[V]--
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what is the use of DrawDragRect function?
Hrishikesh
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From MSDN...
Call it in a loop as you sample mouse position, in order to give visual feedback. When you call DrawDragRect, the previous rectangle is erased and a new one is drawn. For example, as the user drags a rectangle across the screen, DrawDragRect will erase the original rectangle and redraw a new one in its new position. By default, DrawDragRect draws the rectangle by using a halftone brush to eliminate flicker and to create the appearance of a smoothly moving rectangle.
The first time you call DrawDragRect, the lpRectLast parameter should be NULL.
Happy christmas friends. May the Love of My Lord and Saviour Jesus bring forth Joy and Happiness into your life too.
<marquee direction="up" height="50" scrolldelay="1" step="1" scrollamount="1" hspace="2" vspace="2">
--Owner Drawn
--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord
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Can u pls tell me how this line work in details
By default, DrawDragRect draws the rectangle by using a halftone brush to eliminate flicker and to create the appearance of a smoothly moving rectangle.
I actully want to know that how can we eliminate flicker .
is there any role of halftone brush in it .
Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com
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vikas amin wrote: By default, DrawDragRect draws the rectangle by using a halftone brush to eliminate flicker and to create the appearance of a smoothly moving rectangle.
Calm down buddy!
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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