ObjFW  Diff

 * @brief Returns whether the string contains the specified string.
 *
 * @param string The string to search
 * @return Whether the string contains the specified string
 */
- (bool)containsString: (OFString *)string;

/**
 * @brief Creates a substring from the specified index to the end.
 *
 * @param idx The index from where the substring should start, inclusive
 * @return The substring from the specified index to the end
 */
- (OFString *)substringFromIndex: (size_t)idx;

/**
 * @brief Creates a substring from the beginning to the specified index.
 *
 * @param idx The index at which the substring should end, exclusive
 * @return The subtring from the beginning to the specified index
 */
- (OFString *)substringToIndex: (size_t)idx;

/**
 * @brief Creates a substring with the specified range.
 *
 * @param range The range of the substring
 * @return The substring as a new autoreleased OFString
 */
- (OFString *)substringWithRange: (of_range_t)range;