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It's annoying that I cannot use brace initialization in a ternary
conditional expression.
As all know, we can write
int i = some_condition ? 3 : 4;
instead of
int i;
if(some_condition)
   i = 3;
else
   i = 4;

But I cannot write
vector<int> v = some_condition ? {3} : {4}; // not valid C++
instead of
vector<int> v;
if(some_condition)
   v = {3};
else
   v = {4};

I can only write
auto v = some_condition ? vector<int>{3} : vector<int>{4};
but the type vector<int> must be repeated here.

Can we make the following code valid?
vector<int> v = some_condition ? {3} : {4};

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<div dir=3D"ltr">It's annoying that I cannot use brace initialization in a =
ternary conditional expression.<div>As all know, we can write&nbsp;</div><d=
iv><span style=3D"font-size: 13px;">int i =3D some_condition ? 3 : 4;</span=
><br></div><div><span style=3D"font-size: 13px;">instead of</span><br></div=
><div><span style=3D"font-size: 13px;">int i;</span><br></div><div>if(some_=
condition)</div><div>&nbsp; &nbsp;i =3D 3;</div><div>else</div><div>&nbsp; =
&nbsp;i =3D 4;</div><div><br></div><div>But I cannot write</div><div><span =
style=3D"font-size: 13px;">vector&lt;int&gt; v =3D some_condition ? {3} : {=
4}; // not valid C++</span><br></div><div><span style=3D"font-size: 13px;">=
instead of</span><br></div><div><span style=3D"font-size: 13px;">vector&lt;=
int&gt; v;</span><br></div><div>if(some_condition)</div><div>&nbsp; &nbsp;v=
 =3D {3};</div><div>else</div><div>&nbsp; &nbsp;v =3D {4};</div><div><br></=
div><div>I can only write&nbsp;</div><div>auto v =3D some_condition ? vecto=
r&lt;int&gt;{3} : vector&lt;int&gt;{4};</div><div>but the type vector&lt;in=
t&gt; must be repeated here.</div><div><br></div><div>Can we make the follo=
wing code valid?</div><div><span style=3D"font-size: 13px;">vector&lt;int&g=
t; v =3D some_condition ? {3} : {4};</span><br></div></div>

<p></p>

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On 2014-07-11, at 11:50 PM, zwvista@msn.com wrote:

> It's annoying that I cannot use brace initialization in a ternary conditi=
onal expression.

I just replied regarding this very issue on StackOverflow. Interesting that=
 even comments there amount to publicity. Here is what I said:

> That may not be a parsing issue, but a type deduction issue. Both alterna=
tives of the ternary operator need to agree on a common type, and something=
 also has to determine the result value category. The braces obscure the me=
aning of the program. It's better in ?: to be explicit and put the type-nam=
e before the {, and this doesn't sacrifice any expressive power.

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html charset=
=3Dwindows-1252"></head><body style=3D"word-wrap: break-word; -webkit-nbsp-=
mode: space; -webkit-line-break: after-white-space;"><br><div><div>On 2014&=
ndash;07&ndash;11, at 11:50 PM, <a href=3D"mailto:zwvista@msn.com">zwvista@=
msn.com</a> wrote:</div><br class=3D"Apple-interchange-newline"><blockquote=
 type=3D"cite"><div dir=3D"ltr">It's annoying that I cannot use brace initi=
alization in a ternary conditional expression.</div></blockquote><div><br><=
/div><div>I just&nbsp;<a href=3D"http://stackoverflow.com/questions/1142044=
8/initializer-lists-and-rhs-of-operators/11445905#comment38319702_11445905"=
>replied</a>&nbsp;regarding this very issue on StackOverflow. Interesting t=
hat even comments there amount to publicity. Here is what I said:</div><div=
><br></div><div></div><blockquote type=3D"cite"><div><span class=3D"comment=
s">That may not be a parsing issue, but a type deduction issue. Both altern=
atives of the ternary operator need to agree on a common type, and somethin=
g also has to determine the result value category. The braces obscure the m=
eaning of the program. It's better in&nbsp;<code>?:</code>&nbsp;to be expli=
cit and put the type-name before the&nbsp;<code>{</code>, and this doesn't =
sacrifice any expressive power.</span></div></blockquote><div><br></div></d=
iv></body></html>

<p></p>

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