On Tue, Nov 6, 2012 at 9:07 AM, spir <denis.spir@gmail.com> wrote:
format numbers and tostring is uselessly invoked on strings (at least in
code). Are there existing solutions for this?
Here's something that works but is rather inefficient:
function printf (fmt,...)
local args,n = {...},select('#',...)
local idx = 1
fmt:gsub('%%(.)',function(c)
if c == 's' then
args[idx] = tostring(args[idx])
end
idx = idx + 1
end)
print(fmt:format(unpack(args)))
end
printf('%s %d %f %s',{1,2},2,4.2,io.stdout)
But, this kind of stuff is much more efficient in C, since we can
quickly check for %'s in the string and modify the stack before
calling string.format.
steve d.
