On Wednesday, 19 July 2017 at 16:13:28 UTC, Swoorup Joshi wrote:
On Wednesday, 19 July 2017 at 15:31:08 UTC, ag0aep6g wrote:
On 07/19/2017 03:30 PM, sontung wrote:
So I was thinking of some sort of syntax like this:
if(int i = someFunc(); i >= 0)
{
// use i
}
Thoughts on this sort of feature?
I'd prefer a new variant of `with`:
----
with (int i = someFunc()) if (i >= 0)
{
// use i
}
----
It's slightly more verbose, but the meaning is clearer
(arguable). It extends automatically to other control
structures like `switch`.
I wouldn't have this new `with (declaration)` have the magic
lookup rules of the existing `with (expression)`. It would be
a simpler tool that I'd probably use more than the existing
`with`.
I really prefer this over if. This just made sense, just at a
glance
Could also make 'with' behave like 'if', where it could apply to
a block or just a single statement, i.e.
// 'if' examples
if(x)
doSomething
if(x)
{
doSomething
}
// 'with' examples
with(auto x = 0)
doSomething
with(auto x = 0)
{
doSomething
}
This would automatically make it work with any statement:
with(auto x = 0) if(x)
{
doSomething
}
with(auto x = 0) while(x)
{
doSomething
}
Could also do multiple with statements
with(auto x = 0)
with(auto y = 0)
if(check(x, y))
{
doSomething
}