Metaprogramming and Macros in Julia | Stefan Karpinski | Jeff Bezanson

Описание: Abstract:
Julia is homoiconic: it represents its own code as a data structure of the language itself. Since code is represented by objects that can be created and manipulated from within the language, it is possible for a program to transform and generate its own code. Metaprogramming (http://docs.julialang.org/en/release-...) is described in detail in the Julia manual.

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Contents
00:00 Welcome
00:27 Metaprogramming allows you to simplify creating programs that write programs
00:45 Searching for an example of metaprogramming inside Julia code
02:38 Typical problem: how to call LAPACK from inside your code?
03:47 Example: calling function written in C from inside your code
06:17 Example: using for loop and `@eval` to generate code of the functions
10:52 Julia code is represented by Julia data structure
13:06 Question: what symbol can go in between symbols a and b (variables)?
13:58 Refining of last question: what is the default symbol for operator after `+` and `*`.
14:26 `a + b` is just a convenient way of writing `+(a, b)`
15:25 You can construct expressions from the ground up
18:18 Comment on Julia and MATLAB
18:47 Question: what is the relation between Julia's syntax and Abstract Syntax Tree (AST)?
19:42 `@eval` is just shorthand for `eval(quote(...))`
20:40 Macros is a Julia
22:40 Example: `@time` macro
27:07 Question: role of esc in macro hygiene

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