phobos ~master (2024-10-03T07:50:27Z)

hasSwappableElements

std range primitives

Returns true if R is an input range and has swappable elements. The following code should compile for any range with swappable elements.

R r;
static assert(isInputRange!R);
swap(r.front, r.front);
static if (isBidirectionalRange!R) swap(r.back, r.front);
static if (isRandomAccessRange!R) swap(r[0], r.front);
  1. import std.traits;
  2. enum bool isInputRange(R, E);

Examples

static assert(!hasSwappableElements!(const int[]));
static assert(!hasSwappableElements!(const(int)[]));
static assert(!hasSwappableElements!(inout(int)[]));
static assert( hasSwappableElements!(int[]));

static assert(!hasSwappableElements!( string));
static assert(!hasSwappableElements!(dstring));
static assert(!hasSwappableElements!( char[]));
static assert( hasSwappableElements!(dchar[]));

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