iomanip revision f1112427006f4fd9b72cb46acd46ddbbf1e7b741 
1/* -*- c++ -*- */
2/*
3 * Copyright (C) 2010 The Android Open Source Project
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *  * Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 *  * Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in
13 *    the documentation and/or other materials provided with the
14 *    distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
20 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
23 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef ANDROID_ASTL_IOMANIP__
31#define ANDROID_ASTL_IOMANIP__
32
33#include <ostream>
34
35// iomanips are structures used to manipulate streams. There are 3
36// parts to a manip:
37// - a struct to hold the parameters of the manip.
38// - a function in the std namespace to generate the above structure.
39// - a stream operator that takes the structure as second argument and
40//   apply the manip using the params in the structure.
41//
42// This allows something like that : cout << setprecision(10);
43
44namespace android {
45// Structures passed to the streams to set various aspect of it.
46struct SetBase { int base; };
47struct SetPrecision { int precision; };
48}
49
50namespace std {
51
52// Sent to a stream, calls 'precision(size_type)' on the instance.
53inline android::SetPrecision setprecision(int precision) {
54    android::SetPrecision params;
55    params.precision = precision;
56    return params;
57}
58
59inline ostream& operator<<(ostream& os, android::SetPrecision params) {
60    os.precision(params.precision);
61    return os;
62}
63
64// Sent to a stream, set the ios_base::basefield on the instance.
65// Sent to a stream, calls 'precision(size_type)' on the instance.
66inline android::SetBase setbase(int base) {
67    android::SetBase params;
68    params.base = base;
69    return params;
70}
71
72inline ostream& operator<<(ostream& os, android::SetBase params) {
73    os.setf(params.base == 8  ? ios_base::oct :
74            params.base == 10 ? ios_base::dec :
75            params.base == 16 ? ios_base::hex :
76            ios_base::fmtflags(0), ios_base::basefield);
77    return os;
78}
79
80}  // namespace std
81
82#endif
83