On Tuesday, 8 May 2012 at 18:30:08 UTC, Timon Gehr wrote:
On 05/08/2012 10:46 AM, Don Clugston wrote:
On 07/05/12 19:06, deadalnix wrote:
Hi,
Working on D I noticed that some statement, notably assert,
are
expression of type void. Why not all statement (that are not
expression
already) are expression ?
assert isn't a statement. It's an expression ( same as is() ).
What
makes you think it's a statement?
The main use for a void expression is so that it can be used
in a comma
expression; this is why assert is an expression.
The curious thing, which may be the source of the confusion,
is that
static assert() is a statement, while assert() is an
expression. Maybe
static assert should also be an expression rather than a
statement?
static assert is a declaration.
It's a statement when used inside functions, and a "declaration"
(DeclarationDefinition seems to be the spec's term for top-level
constructs) elsewhere. Other syntactic constructs have a similar
duality, e.g. import.
Everything inside a function is a statement, including variable
declarations; they are declaration statements.
