1 files changed, 33 insertions, 0 deletions
diff --git a/src/zisp/value/boole.zig b/src/zisp/value/boole.zig
new file mode 100644
index 0000000..2e94e4d
--- /dev/null
+++ b/src/zisp/value/boole.zig
@@ -0,0 +1,33 @@
+const Value = @import("../value.zig").Value;
+
+pub const f = Value{ .misc = .{ .value = .f } };
+pub const t = Value{ .misc = .{ .value = .t } };
+
+// Zig API
+
+/// Checks if the value is a boole.
+pub fn check(v: Value) bool {
+    return v.bits == f.bits or v.bits == t.bits;
+}
+
+pub fn assert(v: Value) void {
+    if (!check(v)) {
+        v.dump();
+        @panic("not bool");
+    }
+}
+
+pub fn pack(b: bool) Value {
+    return if (b) t else f;
+}
+
+pub fn unpack(v: Value) bool {
+    assert(v);
+    return v.bits == t.bits;
+}
+
+// Zisp API
+
+pub fn pred(v: Value) Value {
+    return pack(check(v));
+}