1/*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19
20#ifndef _THRIFT_TOSTRING_H_
21#define _THRIFT_TOSTRING_H_ 1
22
23#include <cmath>
24#include <limits>
25#include <map>
26#include <set>
27#include <sstream>
28#include <string>
29#include <vector>
30
31namespace apache {
32namespace thrift {
33
34template <typename T>
35std::string to_string(const T& t) {
36 std::ostringstream o;
37 o << t;
38 return o.str();
39}
40
41// TODO: replace the computations below with std::numeric_limits::max_digits10 once C++11
42// is enabled.
43inline std::string to_string(const float& t) {
44 std::ostringstream o;
45 o.precision(static_cast<std::streamsize>(std::ceil(static_cast<double>(std::numeric_limits<float>::digits * std::log10(2.0f) + 1))));
46 o << t;
47 return o.str();
48}
49
50inline std::string to_string(const double& t) {
51 std::ostringstream o;
52 o.precision(static_cast<std::streamsize>(std::ceil(static_cast<double>(std::numeric_limits<double>::digits * std::log10(2.0f) + 1))));
53 o << t;
54 return o.str();
55}
56
57inline std::string to_string(const long double& t) {
58 std::ostringstream o;
59 o.precision(static_cast<std::streamsize>(std::ceil(static_cast<double>(std::numeric_limits<long double>::digits * std::log10(2.0f) + 1))));
60 o << t;
61 return o.str();
62}
63
64template <typename K, typename V>
65std::string to_string(const std::map<K, V>& m);
66
67template <typename T>
68std::string to_string(const std::set<T>& s);
69
70template <typename T>
71std::string to_string(const std::vector<T>& t);
72
73template <typename K, typename V>
74std::string to_string(const typename std::pair<K, V>& v) {
75 std::ostringstream o;
76 o << to_string(v.first) << ": " << to_string(v.second);
77 return o.str();
78}
79
80template <typename T>
81std::string to_string(const T& beg, const T& end) {
82 std::ostringstream o;
83 for (T it = beg; it != end; ++it) {
84 if (it != beg)
85 o << ", ";
86 o << to_string(*it);
87 }
88 return o.str();
89}
90
91template <typename T>
92std::string to_string(const std::vector<T>& t) {
93 std::ostringstream o;
94 o << "[" << to_string(t.begin(), t.end()) << "]";
95 return o.str();
96}
97
98template <typename K, typename V>
99std::string to_string(const std::map<K, V>& m) {
100 std::ostringstream o;
101 o << "{" << to_string(m.begin(), m.end()) << "}";
102 return o.str();
103}
104
105template <typename T>
106std::string to_string(const std::set<T>& s) {
107 std::ostringstream o;
108 o << "{" << to_string(s.begin(), s.end()) << "}";
109 return o.str();
110}
111}
112} // apache::thrift
113
114#endif // _THRIFT_TOSTRING_H_
115