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Checked that the functor passed to partial has some opCall

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This commit is contained in:
Zevenberge 2018-06-29 21:57:07 +02:00
parent 6ce1e5647d
commit 7d1af27290
1 changed files with 8 additions and 1 deletions
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9
std/functional.d
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@ -718,7 +718,9 @@ template partial(alias fun, alias arg)
{
import std.traits : isCallable;
// Check whether fun is a user defined type which implements opCall or a template.
static if (is(typeof(fun) == struct) || is(typeof(fun) == class) || __traits(isTemplate, fun))
// As opCall itself can be templated, std.traits.isCallable does not work here.
enum isSomeFunctor = (is(typeof(fun) == struct) || is(typeof(fun) == class)) && __traits(hasMember, fun, "opCall");
static if (isSomeFunctor || __traits(isTemplate, fun))
{
auto partial(Ts...)(Ts args2)
{
@ -857,6 +859,11 @@ template partial(alias fun, alias arg)
assert(partial!(tcallable, 5)(6) == 11);
static assert(!is(typeof(partial!(tcallable, "5")(6))));
static struct NonCallable{}
static assert(!__traits(compiles, partial!(NonCallable, 5)), "Partial should not work on non-callable structs.");
static assert(!__traits(compiles, partial!(NonCallable.init, 5)),
"Partial should not work on instances of non-callable structs.");
static A funOneArg(A)(A a) { return a; }
alias funOneArg1 = partial!(funOneArg, 1);
assert(funOneArg1() == 1);