Plot2kill 0.2

Nick Sabalausky a at a.a
Sat Mar 5 16:31:23 PST 2011 

"Robert Jacques" <sandford at jhu.edu> wrote in message 
news:op.vrvz7do126stm6 at sandford.myhome.westell.com...
> On Sat, 05 Mar 2011 13:42:32 -0500, bearophile <bearophileHUGS at lycos.com>
> wrote:
>
>> dsimcha:
>>
>>> I've done some major updating of my Plot2kill plotting library lately,
>>
>> I see code that wants named arguments :-)
>>
>> 65     auto sleepinessFig = Figure(sleepinessPlot)
>> 66         .title("Sleepiness Survey")
>> 67         .yLabel("Sleepiness Rating")
>> 68         .xLabel("Activity")
>> 69         .legendLocation(LegendLocation.right)
>> 70         .horizontalGrid(true)
>> 71         .xTickLabels(
>> 72             iota(3),
>> 73             ["In Meeting", "On Phone", "Coding"]
>> 74         );
>>
>> Bye,
>> bearophile
>
> Why? Each of those arguments should be able to be set after creation. So
> given DRY principals, method chaining is the way to go. Besides, Figure
> takes a variable number of plot arguments, which means you couldn't
> support default arguments (at least with the current syntax).

I've also attached this as a file in case it's hard to read on the NG 
clients:

--------------------------------------------------
// Tested on DMD 2.050
import std.variant;

template Optional(T)
{
    alias Algebraic!(T) Optional;
}

template notSpecified(T)
{
    Optional!T notSpecified;
}

Optional!T specified(T)(T val)
{
    return Optional!T(val);
}

void setIfSpecified(T)(ref T target, Optional!T val)
{
    if(val.hasValue())
        target = val.get!T();
}

struct Plot
{
    string name;
}

struct Fancy
{
    string memberVar1;
    int[]  memberVar2;
    bool   memberVar3;

    // I don't know why I need this or why it seems to need to be called 
manually.
    const int opCmp(ref const Fancy other)
    {
        return
            memberVar1 == other.memberVar1 &&
            memberVar2 == other.memberVar2 &&
            memberVar3 == other.memberVar3;
    }
}

struct Figure
{
    Plot   plot;
    string title;
    bool   horizontalGrid;
    Fancy  fancy;

    this(Plot plot)
    {
        this.plot = plot;
    }

    ref Figure set(
        Optional!string title          = notSpecified!string,
        Optional!bool   horizontalGrid = notSpecified!bool,
        Optional!Fancy  fancy          = notSpecified!Fancy
    )
    {
        setIfSpecified!string(this.title,          title);
        setIfSpecified!bool  (this.horizontalGrid, horizontalGrid);
        setIfSpecified!Fancy (this.fancy,          fancy);
        return this;
    }
}

void main()
{
    // All of the ugly 'specified()' could be eliminated if there
    // were some sort of opImplicitCast

    auto fig = Figure(Plot("My Plot"))
        .set(
            specified("My Title"),
            specified(true),
            specified(Fancy("Foo", [1,2,3], true))
        );

    assert(fig.title == "My Title");
    assert(fig.horizontalGrid == true);
    assert(fig.fancy.opCmp( Fancy("Foo", [1,2,3], true) ));

    fig = fig.set().set().set();
    assert(fig.title == "My Title");
    assert(fig.horizontalGrid == true);
    assert(fig.fancy.opCmp( Fancy("Foo", [1,2,3], true) ));

    fig = fig.set( specified("New title name") );
    assert(fig.title == "New title name");
    assert(fig.horizontalGrid == true);
    assert(fig.fancy.opCmp( Fancy("Foo", [1,2,3], true) ));

    // The above maybe aren't so special as-is, but with named arguments
    // the following could be uncommented and used:
    /+

    fig = fig.set(
        fancy: specified(Fancy("Bar", [7,9,12], false)),
        title: specified("Another Title")
    );
    assert(fig.title == "Bar");
    assert(fig.horizontalGrid == true);
    assert(fig.fancy.opCmp( Fancy("Bar", [7,9,12], false) ));

    +/
}

--------------------------------------------------


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!"@``
`
end

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