Templates

[Lorenzo Villani]

Hi, i have a little problem with a simple class (please note that I'm a D newbie)

The folllowing is an initial implementation of a Vector class using templates, modeled after Qt's QVector. As you might notice this is a class wrapper around dynamic sized arrays.

(there's only a little part of the code implemented)

module std.Vector;

class Vector(T) {
private:
	T[] a;
public:
	this() {}

	void append(T value) {
		a.length = a.length + 1;
		a[a.length - 1] = value;
	}

	T at(int i) {
		assert(i >= 0 && i < a.length);
		return a[i];
	}

	int capacity() {
		return size();
	}

	void clear() {
		a.length = 0;
	}

	bool contains(/*const*/ T value) {
		bool c = false;
		foreach (element; a) {
			if (element == T) {
				c = true;
				break;
			}
		}
		return c;
	}

	int count(/*const*/ T value) {
		int c = 0;
		foreach (element; a) {
			if (element == T)
				c++;
		}

		return c;
	}

	int count() {
		return size();
	}

	T first() {
		return a[0];
	}

	int indexOf(/*const*/ T value, int from = 0) {
		int ret = -1;

		for (int i = from; i < a.length; i++) {
			if (a[i] == value)
				ret = i;
		}

		return ret;
	}

	bool isEmpty() {
		if (a.length > 0)
			return true;
		else
			return false;
	}

	T last() {
		return a[a.length];
	}
	
	void popBack() {}
	void popFront() {}
	void prepend(/*const*/ T value) {}

	void pushBack(/*const*/ T value) {}
	void pushFront(/*const*/ T value) {}

	void remove(int i) {
	}

	void remove(int i, int count) {
	}

	void replace(int i, /*const*/ T value) {}

	void resize(int size) {
		a.length = size;
	}

	int size() {
		return a.length;
	}

	T value(int i) {
		assert(i >= 0);
		if (i > a.length) {
			return T;
		} else {
			return a[i];
		}
	}
	
	// TODO: Implement operators
}

Now, if I build a very simple test program such as

import std.stdio;
import std.Vector;

int main() {
       Vector!(Object) myVec;
       myvec.size();
       return 0;
}


The application would compile fine but give a segfault when running. I'm running Linux with Digital Mars D Compiler v1.015 on a Fedora 8 box.

PS: Can you tell me why the compiler doesn't let me use consts in functions declarations?
PPS: I've noticed that the compiler sometimes doesn't tell me about evident mistakes such as writing assertiii() instead of assert() when using CMakeD to build the project...