isInputRange

Determines whether R is an input range.

An input range should define following primitives:

front
empty
popFront

template isInputRange (

R

) {

static if(is(Primitive!(R, "front()") U) && is(ReturnType!((R r) => r.empty) == bool) && is(typeof(R.popFront())))

enum bool isInputRange;

static if(!(is(Primitive!(R, "front()") U) && is(ReturnType!((R r) => r.empty) == bool) && is(typeof(R.popFront()))))

enum bool isInputRange;

}

Members

Variables

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

Parameters

R: The type to be tested.

Return Value

$(D_KEYWORD true) if R is an input range, $(D_KEYWORD false) otherwise.

Examples

static struct Range
{
    void popFront() @nogc nothrow pure @safe
    {
    }

    int front() @nogc nothrow pure @safe
    {
        return 0;
    }

    bool empty() const @nogc nothrow pure @safe
    {
        return true;
    }
}
static assert(isInputRange!Range);
static assert(isInputRange!(int[]));
static assert(!isInputRange!(void[]));

Meta

Source

See Implementation