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It's because there's no way for the compiler to tell when it's doing syntax checking that U<int>.templateMethod is a template function. So, you have to tell it, like so:
cwtm.template templateMethod<int>();
This compiles OK with gcc 4.0.1.
Interestingly, VC++9.0 doesn't care either way - it's happy to compile your original code or the variant with template added in.
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
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Awesome! That worked. Thanks you very much.
So, if I owned a copy of the C++ Standard, would I have found the answer there?
How did you know this?
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jim258kelly wrote: So, if I owned a copy of the C++ Standard, would I have found the answer there?
Possibly - the standard can take some decoding at times (yes, I have a copy). I don't know, I didn't look at the standard.
jim258kelly wrote: How did you know this?
Deduction really - you have to think 'what can the compiler infer, given what it knows'. You've told it that U is a template class, taking a single parameter. So when you assert that it has a member 'templateMethod', that's fine - it's willing to accept that. But when you add the '<', what does it mean? There are two options - it could be a less than operator or it could be a template parameter clause introduction - there's ambiguity. So, to disambiguate, either the compiler gets cleverer (looks like VC++2008 has done that) or you have to explicitly tell the compiler that 'templateMethod' is a template.
With templates, the two things that most often come up are 'can the compiler tell that this symbol is a template' (the case you had) or 'can the compiler tell this is a type', at which point you need to add a 'typename' qualifier, similar to the 'template' one. Consider the (contrived) code below. Without the 'typename', it won't compile (not with g++, anyway) because the compiler can't know that A::size_type is actually a type.
#include <vector>
#include <iostream>
template <class A>
struct GetSize
{
typename A::size_type operator()(A const& a) { return a.size(); }
};
int main()
{
std::vector<int> a(10);
std::cout << GetSize<std::vector<int> >()(a) << std::endl;
}
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
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I am trying to update my resource dll's string table at run time.
That means i want to expose my string table to the end user.
He should be able to update that file before the start up of the application.
And the updated strings should be displayed by the GUI.
One approach that i found is to read from the disk file each time i display string in the GUI.
However that makes my application slow.
I want that at the start up of the application, first it should update its resource dll based on the string table contained on a txt/csv file. And afterwards it should use strings stored in that dll for all its operations.
Please suggest me what can be the other optons to try with.
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Check out UpdateResource[^] for starters.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <
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Hi,
I have problem with Picture control in my project. I am using 3 dialogs. When I put Picture control on my dialog and set properties: Type to Icon, Image is icon ID from resource so I see icon icon in the Picture control - everything looks ok.
But when I build the program so I see different icon in the Picture control - I see a cursor icon(white arrow with question mark) instead of my icon from resource.
This is definition of Picture control from my resource:
ICON IDI_ICON2,IDC_STATIC_ICON,181,154,20,20,0
The value of IDI_ICON2 is 112
I tried create a new project with one dialog box. It was working without any problems.
What am I doing wrong.
Thanks.
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No idea what could be wrong there but did you try changing the value of IDI_ICON2 from 112 to something else, for example to 1000?
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <
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Hi,
thanks for reply.
When I changed the value to 2000 so I see nothing. There is no icon.
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Clean and rebuild your project and see if anything changes.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <
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I cleaned the solution and rebuilt that againt - It's same - I see nothing.
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I see...did you maybe -by mistake- add your icon as cursor resource instead of icon resource, or maybe selected cursor -if possible- instead of icon for the picture control? Does the arrow with questionmark cursor thing appear again if you change the ID back to 112? I did some look around and 112 seems to be the resource ID of the standard "arrow with questionmark" mouse cursor, so my guess is that someone somewhere loads a cursor instead of an icon.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <
modified on Saturday, February 28, 2009 2:39 PM
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I checked it all over again - when I change the value to 2000 I see nothing, to 113 I se different cursor(pen).
In the type properties there is value Icon. There are no curors in the my resource. I see the icon in the Icon folder in the Resource viewer(there are no cursors).
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Well, if you don't mind the workaround, i suggest setting the icon from code using CStatic::SetIcon[^] instead of using the resource...that should help, just use LoadIcon[^] or CWinApp::LoadIcon[^] and then set this to your static control. Don't forget to use DestroyIcon[^] once you are done with it. Your dialog's OnInitDialog[^] is a good place for setting the icon.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <
modified on Saturday, February 28, 2009 3:34 PM
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SendDlgItemMessage(hDlg,IDC_LOGO, STM_SETIMAGE,(WPARAM)IMAGE_BITMAP,(LPARAM) LoadIcon(ghInstance,MAKEINTRESOURCE(IDI_ICON1)));
I see nothing;
GetLasterror returns - The specified resource type cannot be found in the image file.
But this icon - IDI_ICON1 is there because I use it as icon for exe file and for title bar.
I am giving up.
Thanks for you time.
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I am a Novice at c++, and was wondering if anyone knew how to make a program that would count by multiples of 10, and could count up to very large numbers, ex: 500 digits.
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You'll want a 'BigNum' library, like this one[^]. Then your program is as simple as this:
#include <iostream>
#include <gmpxx.h>
int main(int, char**)
{
mpz_class num(10);
while (1)
{
std::cout << num << std::endl;
num += 10;
}
}
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
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Hi All,
I am using a 3rd party dll when i am debuging this dll i am facing a problem the problem is it is skiping the function for example if
there are function in dll suppose
A(); // I WANT TO GET IN TO DEBUG A
B();
But dont know how it is getting in to B.
i am using VS2008 with MFC Feature Pack.
Thanks for any idea or suggestion.
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Unless the dll is supplied with debugging symbols, and you have the source code, the answer is tough. C++ code gets compiled, and ulness you're amazing with assembler, that's largely it.
So, ask the supplier of the 3rd party dll very nicely.
I'm not 100% sure I've understood your question properly though, so feel free to explain it more.
Iain.
Codeproject MVP for C++, I can't believe it's for my lounge posts...
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Hi,
Thanks for your response.
you are correct i am having source code of dll as well with me actually the problem is very dramatic i am inherting a control class in my project and then creating its object then it is not properly working, if i directly create the object of the baseclass then it is working fine for me but if i create the object of my derived class then it is not working for me.... the sample is below
void SEC_TREECLASS::ParseCreateStruct(CREATESTRUCT& cs)
{
DWORD dwTreeStyle = cs.style & TVS_STYLES;
cs.style &= ~TVS_STYLES;
DWORD dwTreeExStyle = cs.dwExStyle & TVXS_STYLES;
cs.dwExStyle &= ~TVXS_STYLES;
// THIS IS THE PROBLEM POINT I WANT TO GET IN TO THIS METHOD BUT
ModifyTreeCtrlStyle( 0, dwTreeStyle, FALSE );
// IT IS JUMPING INSIDE THIS
ModifyTreeCtrlStyleEx( 0, dwTreeExStyle, FALSE );
}
IF I am creating the same thing in sample code then derived class is also working for me ..... i know it is tough to answer because situation is not consistent ....just if some one have faced this problem ever give some suggestion.
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If the dll has debuging symbols you should be able to step into it. And VS will ask you where the source code is. It may be you have a non debug version if that is the case you will need to rebuild the dll from source with symbols.
a programmer traped in a thugs body
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I have the same problem with the same method in BOOL SEC_TREECLASS::ModifyTreeCtrlStyleEx
inside, the first line is
DWORD dwTreeStyleEx = GetTreeCtrlStyleEx();
but it jumps into SetTreeCtrlStyleEx()
How did you manage to overcome your problem?
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It works now.
Stingray should be compiled as MFC Dll Stingray dll and project settings should indicate that these libraries should be used.
Something like _SFLDLL, _OVDLL.... in preprocessor definition should be put
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I use
vector<string> to save a huge file
Each item maybe a word or a sentence
but
vector<string> cost too many memory
eg:
20M file cost 200M+ memory
How can I reduce memory using??? 
Thanks
Techie York
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How about holding the file in a buffer then storing pointers to word beginning & end in the vector:
char* fileBuffer = new char[fileSize];
typedef std::pair<const const=""> Word;
std::vector<word> words;
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
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