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//@ run-pass
#![feature(fn_traits, test)]
extern crate test;
fn test1(a: isize, b: (i32, i32), c: &[i32]) -> (isize, (i32, i32), &[i32]) {
// Test passing a number of arguments including a fat pointer.
// Also returning via an out pointer
fn callee(a: isize, b: (i32, i32), c: &[i32]) -> (isize, (i32, i32), &[i32]) {
(a, b, c)
}
callee(a, b, c)
}
fn test2(a: isize) -> isize {
// Test passing a single argument.
// Not using out pointer.
fn callee(a: isize) -> isize {
a
}
callee(a)
}
#[derive(PartialEq, Eq, Debug)]
struct Foo;
impl Foo {
fn inherent_method(&self, a: isize) -> isize { a }
}
fn test3(x: &Foo, a: isize) -> isize {
// Test calling inherent method
x.inherent_method(a)
}
trait Bar {
fn extension_method(&self, a: isize) -> isize { a }
}
impl Bar for Foo {}
fn test4(x: &Foo, a: isize) -> isize {
// Test calling extension method
x.extension_method(a)
}
fn test5(x: &dyn Bar, a: isize) -> isize {
// Test calling method on trait object
x.extension_method(a)
}
fn test6<T: Bar>(x: &T, a: isize) -> isize {
// Test calling extension method on generic callee
x.extension_method(a)
}
trait One<T = Self> {
fn one() -> T;
}
impl One for isize {
fn one() -> isize { 1 }
}
fn test7() -> isize {
// Test calling trait static method
<isize as One>::one()
}
struct Two;
impl Two {
fn two() -> isize { 2 }
}
fn test8() -> isize {
// Test calling impl static method
Two::two()
}
#[allow(improper_ctypes_definitions)]
extern "C" fn simple_extern(x: u32, y: (u32, u32)) -> u32 {
x + y.0 * y.1
}
fn test9() -> u32 {
simple_extern(41, (42, 43))
}
fn test_closure<F>(f: &F, x: i32, y: i32) -> i32
where F: Fn(i32, i32) -> i32
{
f(x, y)
}
fn test_fn_object(f: &dyn Fn(i32, i32) -> i32, x: i32, y: i32) -> i32 {
f(x, y)
}
fn test_fn_impl(f: &&dyn Fn(i32, i32) -> i32, x: i32, y: i32) -> i32 {
// This call goes through the Fn implementation for &Fn provided in
// core::ops::impls. It expands to a static Fn::call() that calls the
// Fn::call() implementation of the object shim underneath.
f(x, y)
}
fn test_fn_direct_call<F>(f: &F, x: i32, y: i32) -> i32
where F: Fn(i32, i32) -> i32
{
f.call((x, y))
}
fn test_fn_const_call<F>(f: &F) -> i32
where F: Fn(i32, i32) -> i32
{
f.call((100, -1))
}
fn test_fn_nil_call<F>(f: &F) -> i32
where F: Fn() -> i32
{
f()
}
fn test_fn_transmute_zst(x: ()) -> [(); 1] {
fn id<T>(x: T) -> T {x}
id(unsafe {
std::mem::transmute(x)
})
}
fn test_fn_ignored_pair() -> ((), ()) {
((), ())
}
fn test_fn_ignored_pair_0() {
test_fn_ignored_pair().0
}
fn id<T>(x: T) -> T { x }
fn ignored_pair_named() -> (Foo, Foo) {
(Foo, Foo)
}
fn test_fn_ignored_pair_named() -> (Foo, Foo) {
id(ignored_pair_named())
}
fn test_fn_nested_pair(x: &((f32, f32), u32)) -> (f32, f32) {
let y = *x;
let z = y.0;
(z.0, z.1)
}
fn test_fn_const_arg_by_ref(mut a: [u64; 4]) -> u64 {
// Mutate the by-reference argument, which won't work with
// a non-immediate constant unless it's copied to the stack.
let a = test::black_box(&mut a);
a[0] += a[1];
a[0] += a[2];
a[0] += a[3];
a[0]
}
fn main() {
assert_eq!(test1(1, (2, 3), &[4, 5, 6]), (1, (2, 3), &[4, 5, 6][..]));
assert_eq!(test2(98), 98);
assert_eq!(test3(&Foo, 42), 42);
assert_eq!(test4(&Foo, 970), 970);
assert_eq!(test5(&Foo, 8576), 8576);
assert_eq!(test6(&Foo, 12367), 12367);
assert_eq!(test7(), 1);
assert_eq!(test8(), 2);
assert_eq!(test9(), 41 + 42 * 43);
let r = 3;
let closure = |x: i32, y: i32| { r*(x + (y*2)) };
assert_eq!(test_fn_const_call(&closure), 294);
assert_eq!(test_closure(&closure, 100, 1), 306);
let function_object = &closure as &dyn Fn(i32, i32) -> i32;
assert_eq!(test_fn_object(function_object, 100, 2), 312);
assert_eq!(test_fn_impl(&function_object, 100, 3), 318);
assert_eq!(test_fn_direct_call(&closure, 100, 4), 324);
assert_eq!(test_fn_nil_call(&(|| 42)), 42);
assert_eq!(test_fn_transmute_zst(()), [()]);
assert_eq!(test_fn_ignored_pair_0(), ());
assert_eq!(test_fn_ignored_pair_named(), (Foo, Foo));
assert_eq!(test_fn_nested_pair(&((1.0, 2.0), 0)), (1.0, 2.0));
const ARRAY: [u64; 4] = [1, 2, 3, 4];
assert_eq!(test_fn_const_arg_by_ref(ARRAY), 1 + 2 + 3 + 4);
}
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