isLess

Tests whether Args[0] is less than Args[1] according to cmp.

cmp can evaluate to:

$(D_KEYWORD bool): $(D_KEYWORD true) means Args[0] < Args[1].
$(D_KEYWORD int): a negative number means that Args[0] < Args[1], a positive number that Args[0] > Args[1], 0 if they equal.

template isLess (

alias cmp

Args...

) if (

Args.length == 2 &&

__traits(isTemplate, cmp)

) {

static if(is(typeof(result) == bool))

enum bool isLess;

static if(!(is(typeof(result) == bool)))

enum bool isLess;

}

Members

Variables

isLess enum bool isLess;: Undocumented in source.
isLess enum bool isLess;: Undocumented in source.

Parameters

Args: Two aliases to compare for equality.

Return Value

$(D_KEYWORD true) if Args[0] is less than Args[1], $(D_KEYWORD false) otherwise.

Examples

enum bool boolCmp(T, U) = T.sizeof < U.sizeof;
static assert(isLess!(boolCmp, byte, int));
static assert(!isLess!(boolCmp, uint, int));
static assert(!isLess!(boolCmp, long, int));

enum ptrdiff_t intCmp(T, U) = T.sizeof - U.sizeof;
static assert(isLess!(intCmp, byte, int));
static assert(!isLess!(intCmp, uint, int));
static assert(!isLess!(intCmp, long, int));