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version 2.109.1

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Enum member std.meta.staticIsSorted

Checks if an AliasSeq is sorted according to cmp.

enum staticIsSorted(alias cmp, items...) = () { static if (items.length > 1) { static foreach (i, item; items[1..__dollar]) { static if (!isLessEq!(cmp, items[i], item)) { if (__ctfe) return false; } } } return true; } ();

Parameters

cmp = A template that returns a bool (if its first argument is less than the second one) or an int (-1 means less than, 0 means equal, 1 means greater than)

Seq = The AliasSeq to check

Returns

true if Seq is sorted; otherwise false

Example

enum Comp(int N1, int N2) = N1 < N2;
static assert( staticIsSorted!(Comp, 2, 2));
static assert( staticIsSorted!(Comp, 2, 3, 7, 23));
static assert(!staticIsSorted!(Comp, 7, 2, 3, 23));

Example

enum Comp(T1, T2) = __traits(isUnsigned, T2) - __traits(isUnsigned, T1);
static assert( staticIsSorted!(Comp, uint, ubyte, ulong, short, long));
static assert(!staticIsSorted!(Comp, uint, short, ubyte, long, ulong));

Authors

Walter Bright, David Nadlinger

License

Boost License 1.0.