add error

Author: ziteh

error/basic.zig

@@ -0,0 +1,11 @@
+const print = @import("std").debug.print;
+
+const MyError = error{
+    OutOfRange,
+    NotFound,
+};
+
+pub fn main() void {
+    const err: MyError = MyError.OutOfRange;
+    print("{}", .{err});
+}

error/merged.zig

@@ -0,0 +1,19 @@
+const print = @import("std").debug.print;
+
+const AError = error{
+    ErrorA1,
+    ErrorA2,
+};
+
+const BError = error{
+    ErrorB1,
+    ErrorB2,
+};
+
+const CError = AError || BError;
+
+pub fn main() void {
+    const err1: CError = CError.ErrorA1;
+    const err2: CError = CError.ErrorB2;
+    print("{}, {}", .{ err1, err2 });
+}

error/payload.zig

@@ -0,0 +1,19 @@
+const print = @import("std").debug.print;
+
+const MyError = error{
+    OutOfRange,
+    NotFound,
+};
+
+pub fn main() void {
+    const value = do_something() catch |err| {
+        print("Error: {}\n", .{err});
+        return;
+    };
+    print("Value: {}\n", .{value});
+}
+
+fn do_something() MyError!u8 {
+    return MyError.OutOfRange;
+    // return 1;
+}

error/readme.md

@@ -0,0 +1,27 @@
+# Errors
+
+```bash
+$ zig run basic.zig
+error.OutOfRange
+```
+
+```bash
+$ zig run superset.zig
+Yes
+```
+
+```bash
+$ zig run merged.zig
+error.ErrorA1, error.ErrorB2
+```
+
+```bash
+$ zig run union.zig
+Value: 32
+Value: 0
+```
+
+```bash
+$ zig run payload.zig
+Error: error.OutOfRange
+```

error/superset.zig

@@ -0,0 +1,19 @@
+const print = @import("std").debug.print;
+
+const AError = error{
+    Error1,
+    Error2,
+};
+
+const BError = error{
+    Error1,
+};
+
+pub fn main() void {
+    const err_a = AError.Error1;
+    const err_b = BError.Error1;
+
+    if (err_a == err_b) {
+        print("Yes", .{});
+    }
+}

error/union.zig

@@ -0,0 +1,16 @@
+const print = @import("std").debug.print;
+
+const MyError = error{
+    OutOfRange,
+    NotFound,
+};
+
+pub fn main() void {
+    var value: MyError!u8 = 32;
+    var unwrap = value catch 0;
+    print("Value: {}\n", .{unwrap});
+
+    value = MyError.OutOfRange;
+    unwrap = value catch 0;
+    print("Value: {}", .{unwrap});
+}