> If you want a language where const is the default and mutable is a keyword
whats the difference between const and mutable?
whats the difference between const and mutable?
You don't need both a "const" keyword and a "mutable" keyword in a programming language. You only need 1 of the keywords, because the other can be the default. munchler is saying the "const" keyword shouldn't exist, and instead all variables should be constant by default, and we should have a "mutable" keyword to mark variables as mutable.
As opposed to how C++ works today, where there is no "mutable" keyword, variables are mutable by default, and we use a "const" keyword to mark them constant.
What if the lang has pointers? How express read-only?
const ptr; // can't reassign, can't write-through (if r/o by default)
const mut ptr; // can write