src/gromacs/utility/strconvert.h

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  35 /*! \libinternal \file
  36  * \brief
  37  * Declares common utility functions for conversions to and from strings.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \author Mark Abraham <mark.j.abraham@gmail.com>
  41  * \inlibraryapi
  42  * \ingroup module_utility
  43  */
  44 #ifndef GMX_UTILITY_STRCONVERT_H
  45 #define GMX_UTILITY_STRCONVERT_H
  46
  47 #include <string>
  48
  49 #include "gromacs/utility/basedefinitions.h"
  50 #include "gromacs/utility/stringutil.h"
  51
  52 namespace gmx
  53 {
  54
  55 //! \cond libapi
  56 //! \addtogroup module_utility
  57 //! \{
  58
  59 /*! \brief
  60  * Parses a boolean from a string.
  61  *
  62  * \throws  InvalidInputError if `str` is not recognized as a boolean value.
  63  */
  64 bool boolFromString(const char *str);
  65 /*! \brief
  66  * Parses an integer from a string.
  67  *
  68  * \throws  InvalidInputError if `str` is not a valid integer.
  69  *
  70  * Also checks for overflow.
  71  */
  72 int intFromString(const char *str);
  73 /*! \brief
  74  * Parses a 64-bit integer from a string.
  75  *
  76  * \throws  InvalidInputError if `str` is not a valid integer.
  77  *
  78  * Also checks for overflow.
  79  */
  80 int64_t int64FromString(const char *str);
  81 /*! \brief
  82  * Parses a float value from a string.
  83  *
  84  * \throws  InvalidInputError if `str` is not a valid number.
  85  *
  86  * Also checks for overflow.
  87  */
  88 float floatFromString(const char *str);
  89 /*! \brief
  90  * Parses a double value from a string.
  91  *
  92  * \throws  InvalidInputError if `str` is not a valid number.
  93  *
  94  * Also checks for overflow.
  95  */
  96 double doubleFromString(const char *str);
  97
  98 /*! \brief
  99  * Parses a value from a string to a given type.
 100  *
 101  * \tparam T Type of value to parse.
 102  *
 103  * `T` can only be one of the types that is explicity supported.
 104  * The main use for this function is to write `fromString<real>(value)`,
 105  * but it can also be used for other types for consistency.
 106  */
 107 template <typename T> static inline T fromString(const char *str);
 108 //! \copydoc fromString(const char *)
 109 template <typename T> static inline T fromString(const std::string &str)
 110 {
 111     return fromString<T>(str.c_str());
 112 }
 113 /*! \copydoc fromString(const char *)
 114  *
 115  * Provided for situations where overload resolution cannot easily resolve the
 116  * desired std::string parameter.
 117  */
 118 template <typename T> static inline T fromStdString(const std::string &str)
 119 {
 120     return fromString<T>(str.c_str());
 121 }
 122
 123 //! Implementation for boolean values.
 124 template <> inline
 125 bool fromString<bool>(const char *str) { return boolFromString(str); }
 126 //! Implementation for integer values.
 127 template <> inline
 128 int fromString<int>(const char *str) { return intFromString(str); }
 129 //! Implementation for 64-bit integer values.
 130 template <> inline
 131 int64_t fromString<int64_t>(const char *str) { return int64FromString(str); }
 132 //! Implementation for float values.
 133 template <> inline
 134 float fromString<float>(const char *str) { return floatFromString(str); }
 135 //! Implementation for double values.
 136 template <> inline
 137 double fromString<double>(const char *str) { return doubleFromString(str); }
 138
 139 /*! \brief
 140  * Converts a boolean to a "true"/"false" string.
 141  *
 142  * Does not throw.
 143  */
 144 static inline const char *boolToString(bool value)
 145 {
 146     return value ? "true" : "false";
 147 }
 148 /*! \brief
 149  * Returns a string containing the value of \c t.
 150  *
 151  * \throws std::bad_alloc if out of memory.
 152  */
 153 static inline std::string intToString(int t)
 154 {
 155     return formatString("%d", t);
 156 }
 157 //! \copydoc intToString(int)
 158 static inline std::string int64ToString(int64_t t)
 159 {
 160     return formatString("%" PRId64, t);
 161 }
 162 //! \copydoc intToString(int)
 163 static inline std::string doubleToString(double t)
 164 {
 165     return formatString("%g", t);
 166 }
 167
 168 /*! \name
 169  * Overloads for converting a value of a given type to a string.
 170  *
 171  * \throws std::bad_alloc if out of memory.
 172  * \{
 173  */
 174 static inline std::string toString(bool t) { return boolToString(t); }
 175 static inline std::string toString(int t) { return intToString(t); }
 176 static inline std::string toString(int64_t t) { return int64ToString(t); }
 177 static inline std::string toString(float t) { return doubleToString(t); }
 178 static inline std::string toString(double t) { return doubleToString(t); }
 179 static inline std::string toString(std::string t) { return t; }
 180 //! \}
 181
 182 //! \}
 183 //! \endcond
 184
 185 } // namespace gmx
 186
 187 #endif