What is an Effect?
svv1999 at hotmail.com
Sun Jan 2 18:07:14 PST 2011
| Expressions that have no effect, like (x + x), are illegal in
| expression statements.
But what sorts of effects are meant with this?
In phobos the expressionStatement `cmp("foo", "bar");' is used in
unittest.d. A comment says:
| Bring in unit test for module by referencing function in it
wtf? Does this mean, that a second expressionStatement
`cmp("foo", "bar");' in unittest.d would be illegal, but not the first,
because by the second statement the unit test of that module can no more be
Is then in `int x= 42; x= 42;' the assignment of the value `42' to the
varaible `x' illegal, because `x` already has this value as initialization?
Furthermore: is the result of suppressing an effect nevertheless an effect,
especially suppressing the default initialization of a variable?
Somehow this reminds me on the time when set theory got the attribute
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