a geicko-2 based round robin ranking system designed to test c++ battleship submissions
battleship.dunkirk.sh
dunkirk.sh
1// Copyright 2022 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5//go:build go1.19 && !go1.20
6
7package slog
8
9import (
10 "reflect"
11 "unsafe"
12)
13
14type (
15 stringptr unsafe.Pointer // used in Value.any when the Value is a string
16 groupptr unsafe.Pointer // used in Value.any when the Value is a []Attr
17)
18
19// StringValue returns a new Value for a string.
20func StringValue(value string) Value {
21 hdr := (*reflect.StringHeader)(unsafe.Pointer(&value))
22 return Value{num: uint64(hdr.Len), any: stringptr(hdr.Data)}
23}
24
25func (v Value) str() string {
26 var s string
27 hdr := (*reflect.StringHeader)(unsafe.Pointer(&s))
28 hdr.Data = uintptr(v.any.(stringptr))
29 hdr.Len = int(v.num)
30 return s
31}
32
33// String returns Value's value as a string, formatted like fmt.Sprint. Unlike
34// the methods Int64, Float64, and so on, which panic if v is of the
35// wrong kind, String never panics.
36func (v Value) String() string {
37 if sp, ok := v.any.(stringptr); ok {
38 // Inlining this code makes a huge difference.
39 var s string
40 hdr := (*reflect.StringHeader)(unsafe.Pointer(&s))
41 hdr.Data = uintptr(sp)
42 hdr.Len = int(v.num)
43 return s
44 }
45 return string(v.append(nil))
46}
47
48// GroupValue returns a new Value for a list of Attrs.
49// The caller must not subsequently mutate the argument slice.
50func GroupValue(as ...Attr) Value {
51 hdr := (*reflect.SliceHeader)(unsafe.Pointer(&as))
52 return Value{num: uint64(hdr.Len), any: groupptr(hdr.Data)}
53}