http://d.puremagic.com/issues/show_bug.cgi?id=4239
Summary: Mixed tuple comparison
Product: D
Version: future
Platform: Other
OS/Version: Windows
Status: NEW
Severity: enhancement
Priority: P2
Component: Phobos
AssignedTo: nob...@puremagic.com
ReportedBy: simen.kja...@gmail.com
--- Comment #0 from Simen Kjaeraas <simen.kja...@gmail.com> 2010-05-26 14:49:58
PDT ---
I have been unable to find a way to compare two tuples of mixed content, like
(int, "foo"). For this purpose, I have created the following template, and
request its inclusion in Phobos.
/**
Compares tuples with a mixture of types and values.
Example:
----
static assert(SameTuple!(int, int).As!(int, int));
static assert(SameTuple!(int, "foo").As!(int, "foo"));
static assert(!SameTuple!(int, "foo").As!("foo", int));
----
*/
template SameTuple(T...) {
alias SameTupleImpl!T SameTuple;
}
template SameTupleImpl(T...) if (T.length == 1) {
template As(U...) if (U.length == 1) {
static if (is(typeof( T[0])) && is(typeof(U[0]))) {
enum As = T[0] == U[0];
} else static if (!is(typeof( T)) && !is(typeof(U[0]))) {
enum As = is(T[0] == U[0]);
} else {
enum As = false;
}
}
template As(U...) if (U.length != 1) {
enum As = false;
}
}
template SameTupleImpl(T...) if (T.length != 1) {
template As(U...) {
static if (T.length != U.length) {
enum As = false;
} else static if (T.length == 0) {
enum As = true;
} else {
enum As = SameTuple!(T[0]).As!(U[0]) &&
SameTuple!(T[1..$]).As!(U[1..$]);
}
}
}
unittest {
static assert(SameTuple!(int, int).As!(int, int));
static assert(SameTuple!(float).As!(float));
static assert(SameTuple!("foo").As!("foo"));
static assert(!SameTuple!("foo").As!("bar"));
static assert(!SameTuple!(int ).As!("bar"));
static assert(!SameTuple!(int ).As!(float));
static assert(SameTuple!(int, "foo").As!(int, "foo"));
static assert(!SameTuple!(int, "foo").As!("foo", int));
static assert(SameTuple!().As!());
static assert(!SameTuple!(int).As!());
static assert(!SameTuple!().As!(int));
static assert(!SameTuple!("foo").As!());
static assert(!SameTuple!().As!("foo"));
}
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