Am 20.09.2017 um 13:28 schrieb Luiz Henrique de Figueiredo:
local types = {
"nil", "boolean", "number", "string", "table", "function", "userdata", "thread",
}
is = {}
for _,t in pairs(types) do
is[t] = function (v)
if type(v)~=t then
error(t.." expected, got "..type(v),2)
end
return v
end
end
function f() end
x=2
s="a"
s=2
f (is.number (x), is.string (s))
f(x.string(), y.number()) or better: f(x.string, y.number)hence we have to modify the metatables for all data types. Each metatable needs only 1 method: string() for string metatable, number() for number metatable and so on. This function should return the value itself. If i call for instance x.string() on a number value, the method is undefined and a error is raised.
May be i dont see the drawbacks of this idea? Ulrich.