C++ streams question (explanation of comment in code) -

i playing around fastcgi application found here.

the following comment in code:

    if (content) delete []content;      // if output streambufs had non-zero bufsizes ,     // constructed outside of accept loop (i.e.     // destructor won't called here),     // have flushed here. 

my knowledge of c++ streams rather weak. please explain following:

1. which streambufs being referred in comment?
2. under conditions streambufs had non-zero bufsizes?

last not least, can point resource (pun intended) online provides clear gentle introduction c++ io streams?

which streambufs being referred in comment?

it's referring request.out, part of reassigned cout:

fcgx_request request; ...     fcgi_streambuf cout_fcgi_streambuf(request.out);     ...     cout = &cout_fcgi_streambuf; 

this reassignment means user can call

cout << "content-type: text/html\r\n"      << ... 

and have text show-up on either console (for testing) or across network when run cgi application. thus, 1 code sample can run in multiple environments.

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under conditions streambufs had non-zero bufsizes?

the comment you're referring friendly reminder. fcgi_streambuf objects in sample code constructed in loop; when loop ends, go out of scope , destructed.

the comment warns in many circumstances, user have flush output stream:

cout.flush ();