Re: is_at_eof: request for critique

From:

Pete Becker <pete@versatilecoding.com>

Newsgroups:

comp.lang.c++

Date:

Sun, 17 Oct 2010 10:10:42 -0400

Message-ID:

<2010101710104278253-pete@versatilecodingcom>

On 2010-10-17 09:15:49 -0400, Juha Nieminen said:

Brian Wood <woodbrian77@gmail.com> wrote:

[2003 post]

It seems that cout << ist 3x slower than printf().
Could somebody please explain why << is so slow?

Here's what I got after testing similar code (10,000 repetitions of
each)
with MS VC++ 7.1 (using Microsoft's library, including iostreams):

I know that all known implementations of iostream are slower than the
equivalent C stream implementationa (even though in theory the C++ stream
implementations could conceivably be *faster* because there's no need for
format string parsing). However, my attitude towards that is: Know your
tools. If you need extreme I/O speed, use the C stream functions (but be
aware of their problems). If you don't need speed and prefer safety and
versatility, use the C++ streams.

Nah, you're missing the mediocre programmers' mantra: "if it's not
perfect, it's useless." Never mind that for most programs formatted I/O
isn't a bottleneck.

--
Pete
Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The
Standard C++ Library Extensions: a Tutorial and Reference
(www.petebecker.com/tr1book)