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Enum member std.traits.allSameType

enum allSameType(Ts...) = () { static foreach (T; Ts[Ts.length > 1..__dollar]) { static if (!is(Ts[0] == T)) { if (__ctfe) return false; } } return true; } ();


true iff all types Ts are the same.


static assert(allSameType!());
static assert(allSameType!(int));
static assert(allSameType!(int, int));
static assert(allSameType!(int, int, int));
static assert(allSameType!(float, float, float));
static assert(!allSameType!(int, double));
static assert(!allSameType!(int, float, double));
static assert(!allSameType!(int, float, double, real));
static assert(!allSameType!(short, int, float, double, real));

Returns: `true` iff the type `T` can be tested in an <code class="lang-d"><span class="kwd">if</span></code>-expression, that is if <code class="lang-d"><span class="kwd">if </span><span class="pun">(</span><span class="pln">pred</span><span class="pun">(</span><span class="pln">T<wbr/></span><span class="pun">.</span><span class="pln">init</span><span class="pun">)) {}</span></code> is compilable.
enum ifTestable(T, alias pred = a => a) = __traits(compiles, { if (pred(T.init)) {} 


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


Boost License 1.0.