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v/vlib/compiler/tests/generic_test.v

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fn simple<T>(p T) T {
return p
}
fn sum<T>(l []T, nil T) T {
mut r := nil
for e in l {
r += e
}
return r
}
fn map_f<T,U,R>(l []T, f fn(T)U) []U {
mut r := []U
for e in l {
r << f(e)
}
return r
}
fn foldl<T>(l []T, nil T, f fn(T,T)T) T {
mut r := nil
for e in l {
r = f(r, e)
}
return r
}
fn plus<T>(a T, b T) T {
return a+b
}
fn square(x int) int {
return x*x
}
fn mul_int(x int, y int) int {
return x*y
}
fn assert_eq<T>(a, b T) {
r := a == b
println('$a == $b: ${r.str()}')
assert r
}
fn test_generic_fn() {
assert_eq(simple(0+1), 1)
assert_eq(simple('g') + 'h', 'gh')
assert_eq(sum([5.1,6.2,7.0], 0.0), 18.3)
assert_eq(plus(i64(4), i64(6)), i64(10))
a := [1,2,3,4]
$if !windows {
b := map_f(a, square)
assert_eq(sum(b, 0), 30) // 1+4+9+16 = 30
assert_eq(foldl(b, 1, mul_int), 576) // 1*4*9*16 = 576
}
}