Go言語の++/--は文(Statement)

Go言語におけるインクリメント++／デクリメント--演算子は、後置(postfix)記法のみが許容され、式(expression)ではなく 文(statement) を構成する。

i++;  // i += 1; と等価
i--;  // i -= 1; と等価

Why are ++ and -- statements and not expressions? And why postfix, not prefix?
Without pointer arithmetic, the convenience value of pre- and postfix increment operators drops. By removing them from the expression hierarchy altogether, expression syntax is simplified and the messy issues around order of evaluation of ++ and -- (consider f(i++) and p[i] = q[++i]) are eliminated as well. The simplification is significant. As for postfix vs. prefix, either would work fine but the postfix version is more traditional; insistence on prefix arose with the STL, a library for a language whose name contains, ironically, a postfix increment.

https://golang.org/doc/faq

関連URL

• https://github.com/golang/go/issues/21263