Custom Blocks

[Stanislav Blinov]

  10.08.2010 9:19, Kagamin пишет:
> Andrei Alexandrescu Wrote:
>
>> FWIW we've been talking a long time ago about a simple lowering - if the
>> last argument to a function is a delegate, allow moving the delegate's
>> body outside of the function:
>>
>> fun(a, b, c) { body }
>>
>>    |
>>    V
>>
>> fun((a, b, c) { body });
> I don't think, doOnce will work. Though, it's a useful idiom.
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Maybe this one would:

block_template doOnce(string F = __FILE__, int L = __LINE__)() {
    static bool hasRun = false;
    if (!hasRun) {
       hasRun = true;
       $
    }
}

or this one (with proposed lowering syntax):

void doOnce(string F = __FILE__, int L = __LINE__)(void delegate() dg)
{
    static bool hasRun = false;
    if (!hasRun) {
       hasRun = true;
       dg();
    }
}


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