assign-constant: Create a constant (locked) binding.

In hadley/pryr: Tools for Computing on the Language

Create a constant (locked) binding.

Description

Infix wrapper for assign + lockBinding that creates a constant: a binding whose value can not be changed.

Usage

x %<c-% value

Arguments

x	unquoted expression naming variable to create
value	constant value

Examples

x %<c-% 10
#' Generates an error:
## Not run: x <- 20

# Note that because of R's operator precedence rules, you
# need to wrap compound RHS expressions in ()
y %<c-% 1 + 2
y
z %<c-% (1 + 2)
z

hadley/pryr documentation built on Jan. 5, 2024, 10:38 a.m.