arg_env: Get environment or expression from a named argument.

In crowding/vadr: Macros, metaprogramming, and pleasant programming idioms.

Description

arg_env determines the lexical scope of an argument (which must be an un-evaluated promise).

arg_expr fetches the expression attached to an argument in the given environment. The effect is similar to substitute(name) but more specific.

Usage

arg_env(name, envir = arg_env(name, environment()))

arg_expr(name, envir = arg_env(name, environment()))

Arguments

name	A single argument name; not evaluated.
envir	The environment to look for the argument name in. By default looks in the lexical environment of the name argument.

crowding/vadr documentation built on May 14, 2019, 11:33 a.m.