Question

I am getting this warning while compiling the library.

warning: conversion to ‘unsigned char’ from ‘int’ may alter its value

This prevents us from using compiler option -Werror.

Can anyone suggest the way to fix this warning ???

Answer 1

Shoot in the dark:

Use a static_cast to instruct the compiler that you know that the conversion will not result into a truncation: int i; unsigned char c = static_cast<unsigned char>(i);

If you are not so sure, check out boost::numeric_cast.

It’s equivalent to static_cast in this case, but much more explicit (easier to grep / search for numeric conversions). Also, it performs bound checkings.