Type annotating global variables removes much (but not all) of the cost of using non-constant global variables. Trying to re-assign the variable to an object of another type errors: julia> x::Int = 0ĮRROR: MethodError: Cannot `convert` an object of type String to an object of type Int64 In Julia 1.8, it is now possible to specify the type of a non-constant global variable using the x::T syntax where T is the type of the global. Non-constant global variables in Julia come with a performance penalty because the compiler cannot reason about their type since they during runtime can be reassigned to another object of some other type. Therefore, it is now possible to also apply the macro to a given callsite as f(x) which will tell the compiler to inline the method at that specific call.
However, it can be useful to make the choice for a given call site if a function should be inlined. Call site Kadowakiīefore Julia 1.8, the macro could only be used on method definitions and the function would be inlined at all call sites of that method. This can be used to enforce invariants but the compiler can also take advantage of it to improve the generated code. Which causes the field y to be constant (and thus cannot be reassigned after creation of the type). Julia now supports annotating individual fields of a mutable struct with const annotations as: mutable struct T
Lighttable packaged julia update#
Pkg status update with upgradable package indicator.
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