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there appears to be the flexible solution of 'std::optional<T>' too. the
hack solution can also be wrapped in a carefully designed template.

regards,
FM.

2015-01-07 5:54 GMT+03:30 Matthew Fioravante <fmatthew5876@gmail.com>:

>
>
> On Tuesday, January 6, 2015 9:22:20 PM UTC-5, Myriachan wrote:
>>
>>
>> There's always the hackity hack hack way, too:
>>
>> alignas(Foo) unsigned char fooBuffer[sizeof(Foo)];
>> Foo &f = *(condition ? new(fooBuffer) Foo(1) : new(fooBuffer) Foo("abc"
>> ));
>>
>>
> That's a bit too hackity for me. The destructor isn't called automatically
> when the scope exits.
>
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--
how am I supposed to end the twisted road of  your hair in the dark night??
unless the candle of your face does turn a lamp up on my way!!!

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<div dir=3D"rtl"><div dir=3D"ltr">there appears to be the flexible solution=
 of &#39;std::optional&lt;T&gt;&#39; too. the hack solution can also be wra=
pped in a carefully designed template.</div><div dir=3D"ltr"><br></div><div=
 dir=3D"ltr">regards,</div><div dir=3D"ltr">FM.</div></div><div class=3D"gm=
ail_extra"><div dir=3D"ltr"><br><div class=3D"gmail_quote">2015-01-07 5:54 =
GMT+03:30 Matthew Fioravante <span dir=3D"ltr">&lt;<a href=3D"mailto:fmatth=
ew5876@gmail.com" target=3D"_blank">fmatthew5876@gmail.com</a>&gt;</span>:<=
br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left=
:1px #ccc solid;padding-left:1ex"><span class=3D""><br><br>On Tuesday, Janu=
ary 6, 2015 9:22:20 PM UTC-5, Myriachan wrote:<blockquote class=3D"gmail_qu=
ote" style=3D"margin:0;margin-left:0.8ex;border-left:1px #ccc solid;padding=
-left:1ex"><div dir=3D"ltr"><div><br>There&#39;s always the hackity hack ha=
ck way, too:<br><br><div style=3D"background-color:rgb(250,250,250);border-=
color:rgb(187,187,187);border-style:solid;border-width:1px;word-wrap:break-=
word"><code><div><span style=3D"color:#000">alignas</span><span style=3D"co=
lor:#660">(</span><span style=3D"color:#606">Foo</span><span style=3D"color=
:#660">)</span><span style=3D"color:#000"> </span><span style=3D"color:#008=
">unsigned</span><span style=3D"color:#000"> </span><span style=3D"color:#0=
08">char</span><span style=3D"color:#000"> fooBuffer</span><span style=3D"c=
olor:#660">[</span><span style=3D"color:#008">sizeof</span><span style=3D"c=
olor:#660">(</span><span style=3D"color:#606">Foo</span><span style=3D"colo=
r:#660">)];</span><span style=3D"color:#000"><br></span><span style=3D"colo=
r:#606">Foo</span><span style=3D"color:#000"> </span><span style=3D"color:#=
660">&amp;</span><span style=3D"color:#000">f </span><span style=3D"color:#=
660">=3D</span><span style=3D"color:#000"> </span><span style=3D"color:#660=
">*(</span><span style=3D"color:#000">condition </span><span style=3D"color=
:#660">?</span><span style=3D"color:#000"> </span><span style=3D"color:#008=
">new</span><span style=3D"color:#660">(</span><code><span style=3D"color:#=
000">fooBuffer</span><span style=3D"color:#660">) </span></code><span style=
=3D"color:#606">Foo</span><span style=3D"color:#660">(</span><span style=3D=
"color:#066">1</span><span style=3D"color:#660">)</span><span style=3D"colo=
r:#000"> </span><span style=3D"color:#660">:</span><span style=3D"color:#00=
0"> </span><span style=3D"color:#008">new</span><span style=3D"color:#660">=
(</span><code><span style=3D"color:#000">fooBuffer</span><span style=3D"col=
or:#660"></span></code><span style=3D"color:#000"></span><span style=3D"col=
or:#660">)</span><span style=3D"color:#000"> </span><span style=3D"color:#6=
06">Foo</span><span style=3D"color:#660">(</span><span style=3D"color:#080"=
>&quot;abc&quot;</span><span style=3D"color:#660">));</span><span style=3D"=
color:#000"><br></span></div></code></div><br></div></div></blockquote><div=
><br></div></span><div>That&#39;s a bit too hackity for me. The destructor =
isn&#39;t called automatically when the scope exits.=C2=A0</div></blockquot=
e></div><div class=3D"HOEnZb"><div class=3D"h5">

<p></p>

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</div></div></div><br clear=3D"all"><div><br></div>-- <br><div class=3D"gma=
il_signature"><div dir=3D"ltr">how am I supposed to end the twisted road of=
=C2=A0 your hair in the dark night??<br>unless the candle of your face does=
 turn a lamp up on my way!!!<br></div></div>
</div>

<p></p>

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