ext/scintilla/src/UniqueString.h

   1 // Scintilla source code edit control
   2 /** @file UniqueString.h
   3  ** Define UniqueString, a unique_ptr based string type for storage in containers
   4  ** and an allocator for UniqueString.
   5  ** Define UniqueStringSet which holds a set of strings, used to avoid holding many copies
   6  ** of font names.
   7  **/
   8 // Copyright 2017 by Neil Hodgson <neilh@scintilla.org>
   9 // The License.txt file describes the conditions under which this software may be distributed.
  10
  11 #ifndef UNIQUESTRING_H
  12 #define UNIQUESTRING_H
  13
  14 namespace Scintilla::Internal {
  15
  16 constexpr bool IsNullOrEmpty(const char *text) noexcept {
  17         return text == nullptr || *text == '\0';
  18 }
  19
  20 using UniqueString = std::unique_ptr<const char[]>;
  21
  22 /// Equivalent to strdup but produces a std::unique_ptr<const char[]> allocation to go
  23 /// into collections.
  24 UniqueString UniqueStringCopy(const char *text);
  25
  26 // A set of strings that always returns the same pointer for each string.
  27
  28 class UniqueStringSet {
  29 private:
  30         std::vector<UniqueString> strings;
  31 public:
  32         UniqueStringSet();
  33         void Clear() noexcept;
  34         const char *Save(const char *text);
  35 };
  36
  37 }
  38
  39 #endif