Re: [boost] using of circular_buffer

Subject: Re: [boost] using of circular_buffer
From: news.gmane.org (q3wolfi_at_[hidden])
Date: 2012-03-28 11:47:11

hey, this sollution compiles.

due to an error i dont knot if my last message has been sent so here a 
shot overview;

when debugging, i got some errors. do i use the circurlar buffer wrong?

here is an short extraction of my implementation:

class Stringbuffer
{
public:
     Stringbuffer() : buffer(10) {}
     boost::circular_buffer<std::string> buffer;
};

in another class:
class ConsoleText
{
public:
// some declarations
private:
Stringbuffer *textBuffer;
}

then, on the constructor:

ConsoleText::ConsoleText()
{
     textBuffer = new Stringbuffer();
}

during the runtime i do this:

void ConsoleText::GetConsoleMessage(std::string message)
{
     textBuffer->buffer.push_front(message);
}

void ConsoleText::GetConsoleMessage(std::string message, int num)
{
     message += " : ";
     message += toString(num);
     textBuffer->buffer.push_front(message);
}

void ConsoleText::FormatOutput()
{
     outPutText = "";
     for (int i = 0; i < textBuffer->buffer.size(); i++)
     {
         outPutText += textBuffer->buffer.front();
         outPutText += "\n";
     }
}

now, as i've got from the documentation, the last entry of the buffer 
will be overwritten, which just fits into my requirenments.

on this call:
textBuffer->buffer.push_front(message);

i'll get a segmantion fault, which is an indicator of that textBuffer 
wasn't instantiated well.

but where's the problem, i don't see it. sorry - any ideas?

Am 3/28/2012 1:36 PM, schrieb Nelson, Erik - 2:
> news.gmane.org wrote on  Tuesday, March 27, 2012 8:42 PM
>
>> i've defined it in a class after the private-modifier like this:
>
>> boost::circular_buffer<std::string>  textBuffer(10);
>
>> (as take from the documentation)
>
>> but my compiler on minGW will throw an error. so, i guess i got something wrong in declaring a string-textbuffer with the lenght of 10?!
>
>> in the boost-docs there is following example:
>> boost::circular_buffer<int>  cb(3);
>
> Usually you can't specify the constructor arguments at the point of declaration of a class member.  Does something like this work?
>
> Class A
> {
>     A() : textBuffer(10) {}
>     boost::circular_buffer<std::string>  textBuffer;
> };
>
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