Compute Library
 20.08
StringSupport.h
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1 /*
2  * Copyright (c) 2017-2020 Arm Limited.
3  *
4  * SPDX-License-Identifier: MIT
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to
8  * deal in the Software without restriction, including without limitation the
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10  * sell copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in all
14  * copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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22  * SOFTWARE.
23  */
24 #ifndef ARM_COMPUTE_TEST_STRINGSUPPORT
25 #define ARM_COMPUTE_TEST_STRINGSUPPORT
26 
27 #include <cassert>
28 #include <memory>
29 #include <sstream>
30 #include <string>
31 
32 namespace arm_compute
33 {
34 namespace support
35 {
36 namespace cpp11
37 {
38 enum class NumericBase
39 {
40  BASE_10,
41  BASE_16
42 };
43 
44 /** Convert string values to integer.
45  *
46  * @note This function implements the same behaviour as std::stoi. The latter
47  * is missing in some Android toolchains.
48  *
49  * @param[in] str String to be converted to int.
50  * @param[in] pos If idx is not a null pointer, the function sets the value of pos to the position of the first character in str after the number.
51  * @param[in] base Numeric base used to interpret the string.
52  *
53  * @return Integer representation of @p str.
54  */
55 inline int stoi(const std::string &str, std::size_t *pos = 0, NumericBase base = NumericBase::BASE_10)
56 {
57  assert(base == NumericBase::BASE_10 || base == NumericBase::BASE_16);
58  unsigned int x;
59  std::stringstream ss;
60  if(base == NumericBase::BASE_16)
61  {
62  ss << std::hex;
63  }
64  ss << str;
65  ss >> x;
66 
67  if(pos)
68  {
69  std::string s;
70  std::stringstream ss_p;
71 
72  ss_p << x;
73  ss_p >> s;
74  *pos = s.length();
75  }
76 
77  return x;
78 }
79 
80 /** Convert string values to unsigned long.
81  *
82  * @note This function implements the same behaviour as std::stoul. The latter
83  * is missing in some Android toolchains.
84  *
85  * @param[in] str String to be converted to unsigned long.
86  * @param[in] pos If idx is not a null pointer, the function sets the value of pos to the position of the first character in str after the number.
87  * @param[in] base Numeric base used to interpret the string.
88  *
89  * @return Unsigned long representation of @p str.
90  */
91 inline unsigned long stoul(const std::string &str, std::size_t *pos = 0, NumericBase base = NumericBase::BASE_10)
92 {
93  assert(base == NumericBase::BASE_10 || base == NumericBase::BASE_16);
94  std::stringstream stream;
95  unsigned long value = 0;
96  if(base == NumericBase::BASE_16)
97  {
98  stream << std::hex;
99  }
100  stream << str;
101  stream >> value;
102 
103  if(pos)
104  {
105  std::string s;
106  std::stringstream ss_p;
107 
108  ss_p << value;
109  ss_p >> s;
110  *pos = s.length();
111  }
112 
113  return value;
114 }
115 
116 #if(__ANDROID__ || BARE_METAL)
117 /** Convert integer and float values to string.
118  *
119  * @note This function implements the same behaviour as std::to_string. The
120  * latter is missing in some Android toolchains.
121  *
122  * @param[in] value Value to be converted to string.
123  *
124  * @return String representation of @p value.
125  */
127 inline std::string to_string(T && value)
128 {
129  std::stringstream stream;
130  stream << std::forward<T>(value);
131  return stream.str();
132 }
133 
134 /** Convert string values to float.
135  *
136  * @note This function implements the same behaviour as std::stof. The latter
137  * is missing in some Android toolchains.
138  *
139  * @param[in] str String to be converted to float.
140  *
141  * @return Float representation of @p str.
142  */
143 inline float stof(const std::string &str)
144 {
145  std::stringstream stream(str);
146  float value = 0.f;
147  stream >> value;
148  return value;
149 }
150 
151 #else /* (__ANDROID__ || BARE_METAL) */
152 /** Convert integer and float values to string.
153  *
154  * @note This function acts as a convenience wrapper around std::to_string. The
155  * latter is missing in some Android toolchains.
156  *
157  * @param[in] value Value to be converted to string.
158  *
159  * @return String representation of @p value.
160  */
161 template <typename T>
162 inline std::string to_string(T &&value)
163 {
164  return ::std::to_string(std::forward<T>(value));
165 }
166 
167 /** Convert string values to float.
168  *
169  * @note This function acts as a convenience wrapper around std::stof. The
170  * latter is missing in some Android toolchains.
171  *
172  * @param[in] args Arguments forwarded to std::stof.
173  *
174  * @return Float representation of input string.
175  */
176 template <typename... Ts>
177 int stof(Ts &&... args)
178 {
179  return ::std::stof(std::forward<Ts>(args)...);
180 }
181 
182 #endif /* (__ANDROID__ || BARE_METAL) */
183 
184 inline std::string to_string(bool value)
185 {
186  std::stringstream str;
187  str << std::boolalpha << value;
188  return str.str();
189 }
190 
191 } // namespace cpp11
192 } // namespace support
193 } // namespace arm_compute
194 #endif /* ARM_COMPUTE_TEST_STRINGSUPPORT */
unsigned long stoul(const std::string &str, std::size_t *pos=0, NumericBase base=NumericBase::BASE_10)
Convert string values to unsigned long.
Definition: StringSupport.h:91
std::string to_string(bool value)
std::string to_string(T &&value)
Convert integer and float values to string.
Copyright (c) 2017-2020 Arm Limited.
int stoi(const std::string &str, std::size_t *pos=0, NumericBase base=NumericBase::BASE_10)
Convert string values to integer.
Definition: StringSupport.h:55
int stof(Ts &&... args)
Convert string values to float.