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Enum member std.traits.isOrderingComparable

Detects whether T is a comparable type. Basic types and structs and classes that implement opCmp are ordering comparable.

enum isOrderingComparable(T) = is(typeof((ref T a) => a < a ? 1 : 0));


static assert(isOrderingComparable!int);
static assert(isOrderingComparable!string);

static struct Foo {}
static assert(!isOrderingComparable!Foo);

static struct Bar
    int a;
    auto opCmp(Bar b1) const { return a - b1.a; }

Bar b1 = Bar(5);
Bar b2 = Bar(7);
assert(isOrderingComparable!Bar && b2 > b1);


Walter Bright, Tomasz Stachowiak (isExpressions), Andrei Alexandrescu, Shin Fujishiro, Robert Clipsham, David Nadlinger, Kenji Hara, Shoichi Kato


Boost License 1.0.