Re: [Monotone-devel] Descriptors do make a difference 8-O

[Christof Petig]

Florian Weimer schrieb:
>>Is
>>  func((some_string+"something").c_str())
>>guaranteed to work with every compiler.
>
>
> Yes, deallocation of the temporary will be deferred to after the
> evalation of the full expression.
>
> And what are descriptors?

Simple: instead of using something like (pseudo C)
  S= printf("insert into table values ('%s',%d)" , "string", 42)
  sql_execute (S)
you use
  sql_execute("insert into table values (?,?)", "string", 42)

A descriptor points to a prepared (parsed) SQL statement which you can
execute with different data. So descriptors save some string copying and
parsing.

  Christof

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