c++ - Nice way to truncate an integer -


i have function given buffer accepts filled size_t length; however, actual call fills wants int max length.

so, in case parameter cannot fit in integer, want truncated maximum value can fit; couldn't more data anyway.

i can this

int truncatedmaxlen = static_cast<int>(std::min<std::size_t>(maxlength, (std::numeric_limits<int>::max)()));

any less ugly ways?

a branchless way be:

int truncatedmaxlen = maxlength; truncatedmaxlen |= (truncatedmaxlen < maxlength) * std::numeric_limits<int>::max();

for unsigned types nicer because there no sign bit take care of:

unsigned truncatedmaxlen = maxlength; truncatedmaxlen |= -(truncatedmaxlen < maxlength);

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