On Thursday, 31 January 2019 at 22:00:10 UTC, Walter Bright wrote:
On 1/31/2019 1:46 PM, Andrei Alexandrescu wrote:
The proposal could actually disallow rvalues that have lvalue
syntax, such as "symbol", "symbol[expr]", "symbol.symbol",
"symbol.symbol[expr]", etc. Ugh. Gets hairy quickly.
That's why it's problematic to have a rule that rvalues can be
implicitly converted, but not lvalues. There's not a hard line
between lvalues and rvalues. For example,
foreach(i; 0..2)
{
int[] a = [1, 2];
assert(a[0] == 1]);
a[0] = 3; // will this cause the assert to fail?
}
Why would it cause the assert to fail? A new array is constructed
each loop.
