[Solved] Lua constant

[Kavaline]

Searching about constants in lua, I found this link:
https://stackoverflow.com/questions/123 ... ob-with-it
Here was told that in lua 5.4, we can use constants without tricks. Is possile to add this to LÖVE in future?

[darkfrei]

How about just not change vars?

[pgimeno]

No, I don't think it will be added in future. But you can use for example LuaPreprocess.

[ReFreezed]

Whether Lua 5.4 style constants will be supported in LÖVE in the future depends on if the feature gets added to LuaJIT. There are some post-Lua 5.1 features that have been added to LuaJIT (like 'goto') so who knows.

[grump]

For integer constants you can do this in LuaJIT:

Code: Select all

local ffi = require('ffi')
local MyEnum = ffi.typeof([[
	struct {
		enum {
			CONST_A = 23,
			CONST_B = 1337,
			CONST_C = 42,
		};
	}
]])

print(MyEnum.CONST_B) -- 1337
MyEnum.CONST_A = 1 -- error: attempt to write to constant location

This works for integers only though; no other types are supported.

[Kavaline]

No, I don't think it will be added in future. But you can use for example LuaPreprocess.

This is really nice for other purposes!

Whether Lua 5.4 style constants will be supported in LÖVE in the future depends on if the feature gets added to LuaJIT. There are some post-Lua 5.1 features that have been added to LuaJIT (like 'goto') so who knows.

Good to know this one, specially for debug. I saw some features from updated versions, due to this I suggest the constant too

For integer constants you can do this in LuaJIT:

I'm developing a client-server, this will be useful, thanks! With strings have nothing like this?

[RNavega]

You can use the __newindex metamethod of a metatable to implement read-only (aka constant) tables that can have strings / int values etc, like this: https://www.lua.org/pil/13.4.5.html

What makes them read-only is the fact that if you try to modify a value or add a key, they throw an error during runtime.