tuple is a library that provides support for internalized tokens that represent a tuple of Lua values.
local tuple = require("tuple").create
local map = {}
map[tuple(1,2,3) ] = "1,2,3"
map[tuple("A","B","C") ] = "A,B,C"
map[tuple(true,map,false)] = "true,map,false"
map[tuple({},{},{}) ] = "{},{},{}"
assert(map[tuple(1,2,3) ] == "1,2,3")
assert(map[tuple("A","B","C") ] == "A,B,C")
assert(map[tuple(true,map,false)] == "true,map,false")
assert(map[tuple({},{},{}) ] == nil) -- is another tuple
map[tuple(1,2,3) ] = nil
map[tuple("A","B","C") ] = nil
map[tuple(true,map,false)] = nil
local key = next(map)
local v1, v2, v3 = key()
assert(type(v1) == "table")
assert(type(v2) == "table")
assert(type(v3) == "table")
map[key] = nil
assert(next(map) == nil) -- table is empty again!
Download
You can install Tuple through LuaRocks using the following command.
luarocks install tuple
This library is provided as free software under the terms of the MIT License, which are the same terms of the Lua License.
For download see the list of released packages.
Author
This project was created by Renato Maia.