How do i write variables contents in text?

[Assassinbeast]

For example

int x = 10;

sf::text mytext;
mytext.setfont(myfont);
myfont.setstring("bla bla bla (x)") // i want to write "bla bla bla 10"

mywindow.draw(mytext);

So how do i write my variable x's contents if i had to track my score?

[FRex]

Erm.. This is not a SFML question?
Use stringstream(c++ approach) or sprintf(C approach) to convert and then use that as your text.
Also you don't set string to fonts.
You can easily write template function that takes any variable and returns it as string using stringstream.

template <typename T> std::string  EEVarToStr(T targ)
{
        std::stringstream ss;
        ss<<targ;
        return ss.str();
}

[Assassinbeast]

Erm.. This is not a SFML question?
Use stringstream(c++ approach) or sprintf(C approach) to convert and then use that as your text.
Also you don't set string to fonts.
You can easily write template function that takes any variable and returns it as string using stringstream.

template <typename T> std::string  EEVarToStr(T targ)
{
        std::stringstream ss;
        ss<<targ;
        return ss.str();
}

Im not really that advaned yet to use templates.
But yes... it is a sfml question.

Is there a more easy way to do this?
I just made an example to show what i wanted to make.
Siimply, just write my int variable on my screen to show fx the score

[eXpl0it3r]

You don't need to fully understand how the function works to use it.

#include <sstream>
#include <string>
#include <SFML/Graphics>

template <typename T>
std::string toString(T arg)
{
    std::stringstream ss;
    ss << arg;
    return ss.str();
}

int main()
{
    int myInt = 12434;
    sf::Font myFont;
    // load font
    sf::Text myText(toString<int>(myInt), myFont);

    float myFloat = 345.4f
    std::string myString = toString<float>(myFloat);

    // draw sf::Text & do other stuff
}

[FRex]

Templates are nothing compared to polymorphic classes and handling pointers.
exploiter: I think you can ommit the <> block if passed arguments tell the type(ie. here).

You don't need to fully understand how the function works to use it.

http://foldoc.org/Voodoo
You have no idea what kinds of stuff can happen when you say that..

[masskiller]

You have no idea what kinds of stuff can happen when you say that...

It usually leads to forcefully learning through trial and error what could have been read and understood first, but surely it has happened to all of us.

[eXpl0it3r]

I think you can omit the <> block if passed arguments tell the type(ie. here).

Yes you can drop it. Depending on the design decisions you make, you might want to emphasize the type, so you'd for instance notice at compile time when you actually passed a float variable instead of integer instead of later seeing the problem occur at runtime. But it's up to you and for the given examples it doesn't really make sense.

You don't need to fully understand how the function works to use it.

http://foldoc.org/Voodoo
You have no idea what kinds of stuff can happen when you say that..

The idea behind this is abstraction. If I know how to use it and if I know what the final result will be, then it doesn't matter for me what the 'black box' does.
You can argue around as you want, but in the end you're constantly using abstraction and it's (mostly) a good thing. For example you're using SFML without know how every little tiny detail works inside SFML, or you're using the STL without knowing how they really did it, or you're using C++ without even knowing how the compiler creates the machine code for every given compiler flag etc, or you're using the compiled machine code without knowing how your processor actually works inside, etc. etc.

So abstraction is a good thing.

For the function at hand, if we tell him the interface (usage), what the result will be and what can't be done with the function, then there's no need for him to fully understand how it works at this given moment.
Obviously it's essential for progressing with C++ to get to know things like templates but just because you don't understand them (yet) doesn't imply you can't use them and if you do the whole world would explode.

[FRex]

Yes, I probably overstated that. Dealing with lots of voodoo code lately. Sorry.

[Raptor88]

So how do i write my variable x's contents if i had to track my score?

I'm just a beginner C++ and SFML coder myself but maybe this code snippet is what you're looking for:

#include <sstream>
#include <string>

int x = 10;

//----- Concatenate the variable into the text message. -----
std::stringstream ss;

// Concatenates text with variable(s) into one string.
ss << "The value of x = " << x << ".  And I want\n"
"to make this a multi-line text string like this.\n\n";

// Get the entire contents of the stringstream as a single C++ string
std::string myMsg = ss.str();
//---------- End of concatenate code ------------

// You can display myMsg in SFML and get a message that looks like this:
// The value of x = 10.  And I want
// to make this a multi-line text string like this.

 

Hope this helps,
Raptor

[Assassinbeast]

Woaw thanks alot!!!!
this community is so helpful and AWESOME 

[FRex]

That's exactly the same method exploiter shown.

[masskiller]

Woaw thanks alot!!!!
this community is so helpful and AWESOME 

A small tip. The stringstream object doesn't clean it's buffer on it's own, if you concatenate one thing and need to concatenate something else you'll have to reset the string within. Check the STL documentation for more information (and take an overall look, it will surely help you with learning C++).

[FRex]

Im not really that advaned yet to use templates.

Check the StandardTemplateLibrary documentation for more information

Love this forum sometimes. 

[Raptor88]

That's exactly the same method exploiter shown.

Hmmm, I didn't see how text could be combined with a variable using exploiter's code as posted.
Maybe obvious to experienced programmers but not so much to us newbies. 

Thanks,
Raptor

[eXpl0it3r]

Love this forum sometimes. 

And I don't like such 'random' comments...
If you're not aware about this: The acronym STL gets often wrongly used to generally related to the C++ Standard Library and the Standard Template Library. Mostly all C++ developers will understand if you use STL but talk about parts of the C++ Standard Library and many use it because it's short and there's no acronym for C++ Standard Library.

The stringstream object doesn't clean it's buffer on it's own, if you concatenate one thing and need to concatenate something else you'll have to reset the string within.

iirc: ss.str("");

Hmmm, I didn't see how text could be combined with a variable using exploiter's code as posted.
Maybe obvious to experienced programmers but not so much to us newbies. 

sf::Text text;
int a = 45;
float b = 3.4f;
std::string c = "Hello";

text.setString(toString(a) + toString(b) + c);