On Tue, Jan 15, 2013 at 5:49 PM, Steve Lorimer <steve.lorimer@gmail.com> wrote:
> Think about what happens if you feed multiple elements via operator% and
> then call .str() - you get a std::string back - it has to store everything
> you've fed in internally so that you can access the formatted string later
> via .str()

Steve,

Thank you. I never used boost::format::str, but I agree that its
presence indicates that operator% must alter an internal state.

Question 1: Is there an efficient way to do the following (and by
"more efficient" I mean fewer format constructors and string parsing):

void WriteLog(float x, float y, float z, const Employee& e)
{
std::cout
<< "Values: "
<< boost::format("%0.3") % x
<< e
<< boost::format("%0.3") % y
<< boost::format("%0.3") % z;
}

Hi,

I'm no expert here, but I'd try this:

boost::format const fmt("%0.3" );

cout << boost::format(fmt) % x << e << boost::format(fmt) %y ...

HTH,

Kris