Re: Problem with std::map insert - C / C++ / MFC Discussion Boards

vividtang4-May-04 4:02

4-May-04 4:02

#include<iostream>
#include<complex>
using namespace std;
inline complex<double>&operator+=(complex<double>&cval,double dval)
{return cval==complex<double>(dval);
}
int main()
{
complex<double> cval(4.0,9.8);l
cval+=1;
cout<

Re: about inline.

Joe Woodbury4-May-04 4:18

Joe Woodbury

4-May-04 4:18

main isn't returning a value; there is no return statement!

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: about inline.

vividtang4-May-04 15:17

vividtang

4-May-04 15:17

but compile will extend the inline that has the retun value

Re: about inline.

Joe Woodbury4-May-04 19:32

Joe Woodbury

4-May-04 19:32

No it won't, except by chance of register values. If you want a function to return a value in C/C++, you have to use the keyword return.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: about inline.

toxcct4-May-04 21:58

toxcct

4-May-04 21:58

hey,
don't confuse an inline woth a macro. An inline functions stays a function. when the docs say the compiler will extend the inline, first, it is not an obligation (it does it only if the function is not very complicated), second, it does NOT copy the content of the function at the calling, it makes an adaptation.

the function :
<font style="color:blue;">inline int</font> my_sum_func(<font style="color:blue;">int </font>iParam1, <font style="color:blue;">int</font> iParam2) {
    return (iParam1 + iParam2);    <font style="color:green;">// Note the return here !</font>
}
 
the calling :
<font style="color:blue;">void</font> main (<font style="color:blue;">void</font>) {
    <font style="color:blue;">int</font> iSumResult = my_sum_func(5, 3);
}
<font style="color:green;">// Note also that there is no return statement in the main function, and it goes same way</font>

the compiler will extend such code like this :

<font style="color:blue;">void</font> main (<font style="color:blue;">void</font>) {
    <font style="color:blue;">int</font> iSumResult = (5 + 3);
}

are you now convinced ?

!!! : Don't forget : the compiler extends inlines functions only if it can, that is not an obligation to it !

TOXCCT >>> GEII power

Problem with std::map insert

ykutanoor4-May-04 4:01

ykutanoor

4-May-04 4:01

I have a application that inserts a CString and CList in a std::map;

In .h file

typedef CList<csplfiletsinfo*, csplfiletsinfo*=""> SplFileTSInfoList;
typedef std::map<cstring, splfiletsinfolist*=""> tagSplFileInfoMap;

tagSplFileInfoMap m_SplFileInfoMap;
In .cpp file

//A vrialble of type SplFileTSInfoList
SplFileTSInfoList *l_SplFileTSInfoList;

//Insert the Key and the List in to the Map
m_SplFileInfoMap.insert(f_crstrUserID,l_SplFileTSInfoList);

But when I compile this I get an error.

error C2664: 'std::_Tree<_Traits>::iterator std::_Tree<_Traits>::insert(std::_Tree<_Traits>::iterator,const std::_Tree<_Traits>::value_type &)' : cannot convert parameter 1 from 'CString' to 'std::_Tree<_Traits>::iterator'
with
[
_Traits=std::_Tmap_traits<cstring,clist<csplfiletsinfo *,csplfiletsinfo="" *=""> *,std::less<cstring>,std::allocator<std::pair<const cstring,clist<csplfiletsinfo="" *,csplfiletsinfo="" *=""> *>>,false>
]
and
[
_Traits=std::_Tmap_traits<cstring,clist<csplfiletsinfo *,csplfiletsinfo="" *=""> *,std::less<cstring>,std::allocator<std::pair<const cstring,clist<csplfiletsinfo="" *,csplfiletsinfo="" *=""> *>>,false>
]

Re: Problem with std::map insert

Jens Doose4-May-04 4:20

Jens Doose

4-May-04 4:20

Well, I guess you would like to map a string to a CList.
If yes, use this:

<br />
typedef CList SplFileTSInfoList;<br />
typedef std::map< CString, SplFileTSInfoList > tagSplFileInfoMap;<br />
<br />
...<br />
<br />
m_SplFileInfoMap.insert( tagSplFileInfoMap::value_type( f_crstrUserID, l_SplFileTSInfoList ) );<br />
<br />

Jens

Re: Problem with std::map insert

Dean Goodman4-May-04 4:28

Dean Goodman

4-May-04 4:28

Your error is because you aren't calling insert properly. I would guess (though it's hard to tell from your code) that you will want to try

<br />
m_SplFileInfoMap.insert(make_pair(f_crstrUserID, l_SplFileTSInfoList));<br />

--Dean

Problem with std::map

ykutanoor4-May-04 4:01

ykutanoor

4-May-04 4:01

Re: Problem with std::map

Paul Ranson4-May-04 10:03

Paul Ranson

4-May-04 10:03

ykutanoor wrote:
m_SplFileInfoMap.insert(f_crstrUserID,l_SplFileTSInfoList);

Try

m_SplFileInfoMap.insert(std::make_pair(f_crstrUserID,l_SplFileTSInfoList));

There are other idioms for inserting into maps, I suggest reading around a bit.

Paul

Problem with std::map

ykutanoor4-May-04 4:00

ykutanoor

4-May-04 4:00

I have a application that inserts a CString and CList in a std::map;

In .h file

typedef CList<csplfiletsinfo*, csplfiletsinfo*=""> SplFileTSInfoList;
typedef std::map<cstring, splfiletsinfolist*=""> tagSplFileInfoMap;

In .cpp file

//A vrialble of type SplFileTSInfoList
SplFileTSInfoList *l_SplFileTSInfoList;

//Insert the Key and the List in to the Map
m_SplFileInfoMap.insert(f_crstrUserID,l_SplFileTSInfoList);

But when I compile this I get an error.

error C2664: 'std::_Tree<_Traits>::iterator std::_Tree<_Traits>::insert(std::_Tree<_Traits>::iterator,const std::_Tree<_Traits>::value_type &)' : cannot convert parameter 1 from 'CString' to 'std::_Tree<_Traits>::iterator'
with
[
_Traits=std::_Tmap_traits<cstring,clist<csplfiletsinfo *,csplfiletsinfo="" *=""> *,std::less<cstring>,std::allocator<std::pair<const cstring,clist<csplfiletsinfo="" *,csplfiletsinfo="" *=""> *>>,false>
]
and
[
_Traits=std::_Tmap_traits<cstring,clist<csplfiletsinfo *,csplfiletsinfo="" *=""> *,std::less<cstring>,std::allocator<std::pair<const cstring,clist<csplfiletsinfo="" *,csplfiletsinfo="" *=""> *>>,false>
]

Win binaries and UNIX

jimNLX4-May-04 3:58

jimNLX

4-May-04 3:58

I wrote a C++ program the I run on a NT machine that writes structures to a binary file. I then move the binary file to a Unxi machine and I can't read the files correctly.

I am swaping the bytes, is this all that I need to do?

Thanks for ANY help.

Jim

Re: Win binaries and UNIX

Antony M Kancidrowski4-May-04 4:39

Antony M Kancidrowski

4-May-04 4:39

Check the byte alignment. It is possible that the data is not written to the offset that you expect.

Ant.

Re: Win binaries and UNIX

Dean Goodman4-May-04 4:45

Dean Goodman

4-May-04 4:45

It really depends on the architechture of each of the machines -- they might both be Little Endian, Big Endian, or a combination of the two. That is to say, you might not need to swap the bytes at all -- doing so could be what's giving you trouble.

If at all possible, try using the ntohs() and ntohl() functions to ensure you get your data correctly on any architecture.

--Dean

Re: Win binaries and UNIX

Michael Dunn4-May-04 6:11

Michael Dunn

4-May-04 6:11

Also check the struct packing on both compilers, they need to be the same. MSVC defaults to 8 byte alignment, you can change it with #pragma pack

--Mike--
Personal stuff:: Ericahist | Homepage
Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ
----
You cannot truly appreciate Dilbert unless you've read it in the original Klingon.

Re: Win binaries and UNIX

David Chamberlain4-May-04 7:48

David Chamberlain

4-May-04 7:48

Depending on the machine architecture, and that the sizes of similar data types are the same byte length, I have seen issues where machines are not "byte" swapped but are "word" swapped. In those cases, it was every set of two-bytes that needed to be swapped with the next set of two-bytes. This is different than big/little-endian swapping.

If you are writing floating point values into the file, check that the NT format and the UNIX format are the same. NT probably uses the IEEE floating point format and some non-PC UNIX machines (and some hardware items) use a DEC format. This means that the meaning of the bits within a 4-byte floating point word are different ... different size mantissa, exponent, placement of sign bit, etc. I have had to re-align floating point bits between machines.

Dave

"You can say that again." -- Dept. of Redundancy Dept.

Creating a CToolbarCtrl

Rafael Fernández López4-May-04 3:54

Rafael Fernández López

4-May-04 3:54

Hi !

I'm implementing into my project a CToolBarCtrl control. When I call the Create function, it doesn't matter the CRect that I set up because it always draws it on the top or bottom of the window (depends on the property that you set up), but I need to draw it into a CRect like floating into the window.

Could you help me please ?? If you could paste a very little example... thank you !!

Thanks in advance.

Written by: Rafael Fernández López.

void life ( bool me, bool her )
{

if ( her )
{
me = true ;
}
else
{
me = false ;
}

}

Re: Creating a CToolbarCtrl

Michael Dunn4-May-04 4:42

Michael Dunn

4-May-04 4:42

Use the CCS_NOPARENTALIGN style

--Mike--
Personal stuff:: Ericahist | Homepage
Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ
----
Kosh reminded me of some of the prima-donna programmers I've worked with. Knew everything but when you asked them a question; never gave you a straight answer.
-- Michael P. Butler in the Lounge

how to create new file format

Rajesh match4-May-04 3:54

Rajesh match

4-May-04 3:54

Can anyone give me link or where i start
i need to create new audio file foemat like .wav,.dss
pls help me regarding this...
thanx
regards
rajesh

ipc programming

Member 10128694-May-04 3:27

Member 1012869

4-May-04 3:27

How can I use visual c++ to establish a ipc$ connection with a remote hos and copy file from the host or upload a file to the specified path of the host?Is there any detailed demostrations?thanks!

MAPI

asv4-May-04 3:15

asv

4-May-04 3:15

How to implemet MAPIGUID ?example

dadsadasd

Re: MAPI

David Crow4-May-04 3:54

David Crow

4-May-04 3:54

Other than mapiguid.h, I do not know what MAPIGUID is. Can you explain a bit further?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: MAPI

asv4-May-04 4:05

asv

4-May-04 4:05

Thank u for reply.Part of My Apps I want run MAPIUID's? ie mean Access the OutLookExpress Dialog Boxes,Creating New Accounts,Get Accounts .. etc dialogboxes?

I want how run Internet Connection Wizard?

Pl Give an Example.

dadsadasd

Re: MAPI

David Crow4-May-04 4:57

David Crow

4-May-04 4:57

asv wrote:
Access the OutLookExpress Dialog Boxes,Creating New Accounts,Get Accounts .. etc dialogboxes?

Unless Outlook Express exposes an automation interface (like Outlook does), I'm not sure how you'd do this.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: MAPI

asv4-May-04 19:06

asv

4-May-04 19:06

I had problem with LUNCHWIZARDENTRY? I was unable run apps?

satyavasu

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