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annotate cpp/is_number/is_number.hpp @ 622:4baec6555b02

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is_number: initial import, closes #718
author David Demelier <markand@malikania.fr>
date Fri, 20 Oct 2017 13:37:35 +0200
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children b327391f6a62
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4baec6555b02 is_number: initial import, closes #718
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1 /*
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2 * is_number.hpp -- check if string is a number
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3 *
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4 * Copyright (c) 2016-2017 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #ifndef IS_NUMBER_HPP
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20 #define IS_NUMBER_HPP
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21
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22 #include <cstdlib>
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23 #include <string>
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24
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25 /**
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26 * Check if the string is an integer.
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27 *
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28 * \param value the input
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29 * \param base the optional base
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30 * \return true if integer
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31 */
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32 inline bool is_int(const std::string& str, int base = 10) noexcept
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33 {
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34 if (str.empty())
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35 return false;
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36
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37 char* ptr;
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38
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39 std::strtol(str.c_str(), &ptr, base);
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40
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41 return *ptr == 0;
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42 }
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43
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44 /**
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45 * Check if the string is real.
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46 *
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47 * \param value the value
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48 * \return true if real
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49 */
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50 inline bool is_real(const std::string &str) noexcept
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51 {
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52 if (str.empty())
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53 return false;
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54
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55 char* ptr;
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56
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57 std::strtod(str.c_str(), &ptr);
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58
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59 return *ptr == 0;
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60 }
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61
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62 /**
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63 * Check if the string is a number.
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64 *
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65 * \param value the value
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66 * \return true if it is a number
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67 */
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68 inline bool is_number(const std::string& str) noexcept
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69 {
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70 return is_int(str) || is_real(str);
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71 }
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72
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73 #endif // !IS_NUMBER_HPP