C++ Runtime string formatting

Question

Usually I use streams for formatting stuff however in this case ?I don't know the format until runtime.

I want to be able to take something like the following format string:
Hello {0}! Your last login was on {1,date:dd/mm/yy}.
...and feed in the variables "Fire Lancer" and 1247859223, and end up with the following formatted string:
Hello Fire Lancer! Your last login was on 17/07/09.

In other languages I use there is built in support for this kind of thing, eg pythons format string method, however in c++ there doesn't seem to be any such functionality, accept the C print methods which are not very safe.

Also this is for a high performance program, so whatever solution I use needs to parse the format string once and store it (eg mayby a Parse method that returns a FormatString object with a Format(string) method), not reparse the string every time the format method is called...

Your high-performance program rapidly greets the user?

GManNickG
– GManNickG

2009-07-17 19:42:49 +00:00
Commented Jul 17, 2009 at 19:42 — GManNickG
– GManNickG, Commented Jul 17, 2009 at 19:42
@GMan hahahahaha. Im still asking myself that question too

Gustavo Muenz
– Gustavo Muenz

2009-07-17 20:03:27 +00:00
Commented Jul 17, 2009 at 20:03 — Gustavo Muenz
– Gustavo Muenz, Commented Jul 17, 2009 at 20:03

Éric Malenfant · Accepted Answer · 2009-07-17 19:58:43Z

2

Your format string looks very much like those used in ICU MessageFormat. Did you consider using it?

answered Jul 17, 2009 at 19:58

Éric Malenfant

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Community · Accepted Answer · 2017-05-23 12:19:37Z

2

Boost Formatting does that for you:

http://www.boost.org/doc/libs/1_39_0/libs/format/doc/format.html

Check out this question and answer for examples of usage:

edited May 23, 2017 at 12:19

CommunityBot

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answered Jul 17, 2009 at 19:42

Loki Astari

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bdonlan · Accepted Answer · 2009-07-17 19:41:41Z

0

boost::format will do the positional arguments portion, but not the date formatting...

answered Jul 17, 2009 at 19:41

bdonlan

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