Get a copy of the underlying pointer.

! @brief check whether a string is UTF-8 encoded The function checks each byte of a string whether it is UTF-8 encoded. The result of the

! @brief creates a diff as a JSON patch Creates a [JSON Patch](http://jsonpatch.com) so that value @a source can be changed into the valu

The real numeric difference between this and `rhs`. Only avaliable if `wrapped_type` is random access.

Advances the internal state by z times

Advances the internal state by z times

! @brief dump escaped string Escape a string by replacing certain special characters by a sequence of an escape character (backslash) and

! @brief dump a floating-point number Dump a given floating-point number to output stream @a o. Works internally with @a number_buffer.

! @brief checks whether the container is empty. Checks if a JSON value has no elements (i.e. whether its @ref size is `0`). @return The

named queries

checks whether the buffer is empty */

Returns its own value if the result is `err`, otherwise returns `def`