C++

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From: Simon Wistow
Subject: C++
Date: 15:29 on 02 Mar 2004
In someways it's nice but it's just all the little shit bits that are 
really pissing me off today. I admit that most are because I've been 
spiled with my wonderful experiences with the incomparable joy that 
is Perl but here I shall detail some of the more heinous hates.


	public:
		 string error();

	private:
		string error;



one is a method, one is a member. Why won't you let me have both. 


Similarly I want, ala my Perl experiences the classes

	Reelmaker
	Reelmaker::Generator (used as a helper class by Reelmaker)
	Reelmaker::Generator::Quicktime (a sub class of R:G)


i.e I want three classes and two namespaces - Reelmaker and 
Reelmaker::Generator.

BZZZZZT! No can do - can't have a class and a namespace named the same 
thing.

I'll admt that, in general, strings (as done via std::string) is much 
nicer than the char * shennanigans that I'm used to from C but, when I 
wnat to find the file extension of something in C I do


	  tmp = strrchr(filename, '.');
      if(tmp) {
		printf("file extension of %s is %s\n, filename, ++tmp);
	  }


in C++

	string::size_type pos = filename.rfind(".");
	if (pos == string::npos) {
		string ext = filename.substr(pos+1,filename.size()-pos);
		cerr << "File extension of << filename << " is " << ext << endl; 
	}

which feels far more cumbersome.

Sticking with strings - why isn't there a format method, why, if I have 
a format and a number and I want them to end up in a string do I have to 
do something like

	// format is something like 'filename%d.jpg'
	char * output = (char *) malloc(sizeof(char) * 1024);
	if (!output) {
		cerr << "Couldn't alloc filename" << endl;
		return 0;
	}
	
	// we use the filename like a format 
	int ret = snprintf(output, 1024, format.c_str(), frame++);
	if (ret <0 ) {
		cerr << "Couldn't format filename : " << format << endl;
		return 0;
	}
	
	string filename = output;
	free(output);
	return filename


and even fucking worse why if I can do something like


	cerr << "The input " << input << "is invalid" << endl;

if num is a string, int or floats but, if I want to do something like

	error = "The input " + input + "is invalid";

it'll only work for strings. For itns I have to jump through these hoops

	error = "The input " + string(""+input) + "is invalid";

and I have to do snprintf hoops for floats.

Sigh.

I believe the phrase I'm stretching for is "ha' penny worth o' tar"

Simon

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