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Enum member std.range.primitives.hasAssignableElements
Returns true
if R
is an input range and has mutable
elements. The following code should compile for any range
with assignable elements.
enum hasAssignableElements(R)
= isInputRange!R && is(typeof(lvalueOf!R .front = lvalueOf!R .front)) && (!isBidirectionalRange!R || is(typeof(lvalueOf!R .back = lvalueOf!R .back))) && (!isRandomAccessRange!R || is(typeof(lvalueOf!R[0] = lvalueOf!R .front)));
R r;
static assert(isInputRange!R);
r .front = r .front;
static if (isBidirectionalRange!R) r .back = r .front;
static if (isRandomAccessRange!R) r[0] = r .front;
Example
static assert(!hasAssignableElements!(const int[]));
static assert(!hasAssignableElements!(const(int)[]));
static assert( hasAssignableElements!(int[]));
static assert(!hasAssignableElements!(inout(int)[]));
static assert(!hasAssignableElements!( string));
static assert(!hasAssignableElements!(dstring));
static assert(!hasAssignableElements!( char[]));
static assert( hasAssignableElements!(dchar[]));
Authors
Andrei Alexandrescu, David Simcha, and Jonathan M Davis. Credit for some of the ideas in building this module goes to Leonardo Maffi.
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.