write some stuff about language goals

1 files changed, 33 insertions, 0 deletions

diff --git a/doc/generics.txt b/doc/generics.txt
new file mode 100644
index 0000000..22745c1
--- /dev/null
+++ b/doc/generics.txt
@@ -0,0 +1,33 @@
+struct DynArr(T) {
+	data ^T,
+	len, cap i64
+}
+
+proc da_fit(da ^DynArr(T), n i64, a ^Arena) {
+	let c = da^.cap
+	if c <= n {
+		if c = 0 { c := 1 }
+		while c <= n {
+			c := c << 1
+		}
+		da^.data := arena_realloc(a, da^.data, da^.cap * sizeof(T), alignof(T))
+		da^.cap := c
+	}
+}
+
+proc da_push(da ^DynArr(T), v T, a ^Arena) {
+	da_fit(da, da^.len + 1, a)
+	da^.data[da^.len] := v
+	da^.len := da^.len + 1
+}
+
+proc main {
+	let a = Arena {}
+	let v = DynArr(i32) {}
+	da_push(&v, 1, &a)
+	da_push(&v, 2, &a)
+	da_push(&v, 3, &a)
+	da_push(&v, 4, &a)
+	da_push(&v, 5, &a)
+	da_push(&v, 6, &a)
+}