Simplified documentation for the pointer passing interface.

FossilOrigin-Name: 2dfcd9a8ecdf0ddd8e044d820639830c6171141c588cf0224255af85c64cf79c

manifest

@@ -1,5 +1,5 @@
-C Add\sdestructor\sfunctions\sfor\sthe\spointer\sargument\s(NB:\snot\sthe\stype\sstring)\nto\sthe\ssqlite3_bind_pointer()\sand\ssqlite3_result_pointer()\sinterfaces.\s\sUse\nthis\snew\scapability\sto\sresolve\sa\spointer\sleak\sin\sthe\scustom\sgeometry\sfunction\nmechanism\sof\sthe\sRTREE\sextension.
-D 2017-07-27T17:45:08.840
+C Simplified\sdocumentation\sfor\sthe\spointer\spassing\sinterface.
+D 2017-07-27T18:43:13.023
 F Makefile.in d9873c9925917cca9990ee24be17eb9613a668012c85a343aef7e5536ae266e8
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@@ -455,7 +455,7 @@ F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
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-F src/sqlite.h.in 86a14aab0f03021bdc71e8a78091ca52931cdc3dc69633dacf9a511dfe9ee993
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manifest.uuid

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src/sqlite.h.in

@@ -3886,17 +3886,11 @@ typedef struct sqlite3_context sqlite3_context;
 ** ^The sqlite3_bind_pointer(S,I,P,T,D) routine causes the I-th parameter in
 ** [prepared statement] S to have an SQL value of NULL, but to also be
 ** associated with the pointer P of type T.  ^D is either a NULL pointer or
-** a pointer to a destructor function that is called when P goes out of scope.
-** ^The sqlite3_bind_pointer() routine can be used to pass
-** host-language pointers into [application-defined SQL functions].
-** ^A parameter that is initialized using [sqlite3_bind_pointer()] appears
-** to be an ordinary SQL NULL value to everything other than
-** [sqlite3_value_pointer()].  The T parameter should be a static string,
-** preferably a string literal.  The procedure that invokes 
-** sqlite3_bind_pointer(S,I,P,T,D) owns the T string and
-** must guarantee that it remains valid and unchanged until after the last
-** access via [sqlite3_value_pointer()].  The sqlite3_bind_pointer() routine
-** is part of the [pointer passing interface] added for SQLite 3.20.0.
+** a pointer to a destructor function for P. ^SQLite will invoke the
+** destructor D with a single argument of P when it is finished using
+** P.  The T parameter should be a static string, preferably a string
+** literal. The sqlite3_bind_pointer() routine is part of the
+** [pointer passing interface] added for SQLite 3.20.0.
 **
 ** ^If any of the sqlite3_bind_*() routines are called with a NULL pointer
 ** for the [prepared statement] or with a prepared statement for which
@@ -4767,7 +4761,8 @@ SQLITE_DEPRECATED int sqlite3_memory_alarm(void(*)(void*,sqlite3_int64,int),
 ** using [sqlite3_bind_pointer(S,I,P,X,D)] or [sqlite3_result_pointer(C,P,X,D)]
 ** and if X and Y are strings that compare equal according to strcmp(X,Y),
 ** then sqlite3_value_pointer(V,Y) will return the pointer P.  ^Otherwise,
-** sqlite3_value_pointer(V,Y) returns a NULL.
+** sqlite3_value_pointer(V,Y) returns a NULL. The sqlite3_bind_pointer() 
+** routine is part of the [pointer passing interface] added for SQLite 3.20.0.
 **
 ** ^(The sqlite3_value_type(V) interface returns the
 ** [SQLITE_INTEGER | datatype code] for the initial datatype of the
@@ -5108,14 +5103,10 @@ typedef void (*sqlite3_destructor_type)(void*);
 ** NULL value such that the pointer can be retrieved within an
 ** [application-defined SQL function] using [sqlite3_value_pointer()].
 ** ^If the D parameter is not NULL, then it is a pointer to a destructor
-** for the P parameter.  ^The destructor D is invoked on P when the result
-** value goes out of scope.
-** The T parameter should be a static string and preferably a string
-** literal. The procedure that invokes sqlite3_result_pointer(C,P,T,D)
-** continues to own the P and T pointers and must guarantee that 
-** those pointers remain valid until after the last access via
-** [sqlite3_value_pointer()].  The sqlite3_result_pointer() routine
-** is part of the [pointer passing interface] added for SQLite 3.20.0.
+** for the P parameter.  ^SQLite invokes D with P as its only argument
+** when SQLite is finished with P.  The T parameter should be a static
+** string and preferably a string literal. The sqlite3_result_pointer()
+** routine is part of the [pointer passing interface] added for SQLite 3.20.0.
 **
 ** If these routines are called from within the different thread
 ** than the one containing the application-defined function that received