Function CreateSharedString

Libs/flatbuffers/flatbuffers.h:1683–1701

@brief Store a string in the buffer, which can contain any binary data. If a string with this exact contents has already been serialized before, instead simply returns the offset of the existing string. This uses a map stored on the heap, but only stores the numerical offsets. @param[in] str A const char pointer to the data to be stored as a string. @param[in] len The number of bytes that should b

  /// @param[in] len The number of bytes that should be stored from `str`.
  /// @return Returns the offset in the buffer where the string starts.
  Offset<String> CreateSharedString(const char *str, size_t len) {
    FLATBUFFERS_ASSERT(FLATBUFFERS_GENERAL_HEAP_ALLOC_OK);
    if (!string_pool)
      string_pool = new StringOffsetMap(StringOffsetCompare(buf_));
    auto size_before_string = buf_.size();
    // Must first serialize the string, since the set is all offsets into
    // buffer.
    auto off = CreateString(str, len);
    auto it = string_pool->find(off);
    // If it exists we reuse existing serialized data!
    if (it != string_pool->end()) {
      // We can remove the string we serialized.
      buf_.pop(buf_.size() - size_before_string);
      return *it;
    }
    // Record this string for future use.
    string_pool->insert(off);
    return off;
  }

#ifdef FLATBUFFERS_HAS_STRING_VIEW
  /// @brief Store a string in the buffer, which can contain any binary data.