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digitalmars.D - My presentation at Oscon last Thursday

reply Walter Bright <newshound2 digitalmars.com> writes:
http://assets.en.oreilly.com/1/event/45/The%20D%20Programming%20Language%20Presentation.pdf
Jul 24 2010
next sibling parent reply bearophile <bearophileHUGS lycos.com> writes:
Walter Bright:

 http://assets.en.oreilly.com/1/event/45/The%20D%20Programming%20Language%20Presentation.pdf


I'm currently reading many other PDF/PPT from other conferences too.

In your RAII example you are doing something that's scary, mixing C heap
allocations with D GC heap allocations with C free. This is a program based on
your code:

import std.c.stdlib: malloc, free;
struct Buffer {
    this(size_t s) {
        buf = malloc(s)[0 .. s];
    }
    this(this) {
        buf = buf.dup;
    }
    ~this() {
        free(buf.ptr);
    }
    void[] buf;
}
void main() {
    auto b1 = Buffer(100);
    auto b2 = b1;
}

But I think this is better:

import std.c.stdlib: malloc, free;
struct Buffer {
    this(size_t s) {
        buf = malloc(s)[0 .. s];
    }
    this(this) {
        void* newbuf = malloc(buf.length);
        newbuf[0 .. buf.length] = buf[];
        buf = newbuf[0 .. buf.length];
    }
    ~this() {
        free(buf.ptr);
    }
    void[] buf;
}
void main() {
    auto b1 = Buffer(100);
    auto b2 = b1;
}


This is your example for the functional style:

pure sum_of_squares
 (immutable double[] a)
{
    auto sum = 0;

  parent  Walter Bright <newshound2 digitalmars.com>  writes:


bearophile wrote:

 In your RAII example you are doing something that's scary, mixing C heap
 allocations with D GC heap allocations with C free.


You're right, the buf.dup code is not only scary, it's dead wrong. My screw up. 
Derp, derp.



 Jul 24 2010



prev sibling  parent reply bearophile <bearophileHUGS lycos.com>  writes:


The slides for another talk,  "Build Your Own Contributors (One Part at a
Time)", by Denise Paolucci (Dreamwidth Studios), Mark Smith (Dreamwidth
Studios):

http://assets.en.oreilly.com/1/event/45/Build%20Your%20Own%20Contributors%20_One%20Part%20at%20a%20Time_%20Presentation%201.ppt

Some of the things it says seems good to improve the D community management.

Bye,
bearophile



 Jul 24 2010



  parent  bearophile <bearophileHUGS lycos.com>  writes:


Nice slides, "High Wizardry in the Land of Scala Presentation" by Daniel
Spiewak, in pages 4-36 he shows Higher-Kinds and Typeclasses, that can be
interesting for D programmers too:

http://assets.en.oreilly.com/1/event/45/High%20Wizardry%20in%20the%20Land%20of%20Scala%20Presentation.pdf

Bye,
bearophile



 Jul 25 2010