Push new gap, move s count bytes further (skipping the gap). Collapse previous gap.

Bind lua native function.

* Test two iterator are equal or not. */

* Move iterator to next position. */

Emulate snprintf() on MSVC<2015, _snprintf() doesn't zero-terminate the buffer * on overflow... */

* Get pointer that pointed by iterator. */

* Test pair is initialized by pair initialization functions. */

index starts from 0; */

index starts from 0 */

* Get basic_string element size. */

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* Select binary function accroding to binary function type. */

* Allocate to user specified amount of memory. */

added by bennewit@cs.tu-berlin.de */

* Test whether the [it_first, it_end) is valid range. */

added by bennewit@cs.tu-berlin.de */

append string_osip_to_append to string at position cur size is the current allocated size of the element */

* Test basic_string is initialized by basic_string initialization functions. */

* Release allocated memory */

---For better performance--- Same as above, only this time we know the length */

* Get character string. */