src/gromacs/utility/stringstream.h

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  35 /*! \libinternal \file
  36  * \brief
  37  * Declares implementations for textstream.h interfaces for input/output to
  38  * in-memory strings.
  39  *
  40  * \author Teemu Murtola <teemu.murtola@gmail.com>
  41  * \inlibraryapi
  42  * \ingroup module_utility
  43  */
  44 #ifndef GMX_UTILITY_STRINGSTREAM_H
  45 #define GMX_UTILITY_STRINGSTREAM_H
  46
  47 #include <string>
  48 #include <vector>
  49
  50 #include "gromacs/utility/textstream.h"
  51
  52 namespace gmx
  53 {
  54
  55 /*! \libinternal \brief
  56  * Text output stream implementation for writing to an in-memory string.
  57  *
  58  * Implementations for the TextOutputStream methods throw std::bad_alloc if
  59  * reallocation of the string fails.
  60  *
  61  * \inlibraryapi
  62  * \ingroup module_utility
  63  */
  64 class StringOutputStream : public TextOutputStream
  65 {
  66 public:
  67     //! Returns the text written to the stream so far.
  68     const std::string& toString() const { return str_; }
  69
  70     // From TextOutputStream
  71     void write(const char* text) override;
  72     void close() override;
  73
  74 private:
  75     std::string str_;
  76 };
  77
  78 template<typename T>
  79 class ArrayRef;
  80
  81 /*! \libinternal \brief
  82  * Helper class to convert static string data to a stream.
  83  *
  84  * Provides a text input stream that returns lines from a string
  85  */
  86 class StringInputStream : public TextInputStream
  87 {
  88 public:
  89     /*! \brief
  90      * Constructor that stores input lines in a string.
  91      *
  92      * The string is internally but no processing is done.
  93      *
  94      * \param[in] input String to be served by the stream.
  95      */
  96     explicit StringInputStream(const std::string& input);
  97     /*! \brief
  98      * Constructor that stores input lines in a string.
  99      *
 100      * The vector of strings is stored as a string separated by newline.
 101      *
 102      * \param[in] input String to be served by the stream.
 103      */
 104     explicit StringInputStream(const std::vector<std::string>& input);
 105     /*! \brief
 106      * Constructor that stores input lines in a string.
 107      *
 108      * The array of char * is stored as a string separated by newline.
 109      *
 110      * \param[in] input Array of char * to be served by the stream.
 111      */
 112     explicit StringInputStream(ArrayRef<const char* const> const& input);
 113
 114     // From TextInputStream
 115     bool readLine(std::string* line) override;
 116     void close() override {}
 117
 118 private:
 119     std::string input_;
 120     size_t      pos_;
 121 };
 122
 123 } // namespace gmx
 124
 125 #endif