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When talking about imports, the word prelude is used every so often by the rustaceans.
What is this prelude they talk about?
How does it affect my Rust programs?
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' The goal of the poem is to demonstrate his fitness to produce great poetry, and The Prelude itself becomes evidence of that fitness." It traces the growth of the poet's mind by stressing the mutual consciousness and spiritual communion between the world of nature and man.
The Prelude is a long autobiographical poem in which William Wordsworth depicts his own spiritual and poetic development. In this excerpt, Wordsworth recounts an episode from his childhood, when he stole a small boat and rowed into the middle of a lake at night.
The Prelude, in full The Prelude, or Growth of a Poet's Mind, autobiographical epic poem in blank verse by William Wordsworth, published posthumously in 1850. Originally planned as an introduction to another work, the poem is organized into 14 sections, or books.
The poet's aim was to write a three part autobiographical epiccalled “The Recluse”, with The Prelude being the first volume of 400 pages. He wanted to present ideas from his past then explore their philosophical significance through the medium of nature and society, but sadly died before its completion. of the world.
In Rust, in order to use a symbol, you must either:
use directive: use std::mem; std::mem::replace however, some very few symbols can be used without such actions: Option or Copy for example!
This is due to the Rust prelude.
A number of traits, types and functions were judged to be so frequently used that it made sense not to require that their use required explicitly importing the necessary symbols each and every time. This is achieved thanks to two implicit actions taken by the compiler:
extern crate std; use std::prelude::v1::*; (for now)std::prelude::v1 is just a regular module which re-exports those frequently used symbols using the pub use ... syntax. Its exact content can be found here.
A number of other libraries, or even sub-components of the standard library also define a prelude module that you may import with the same glob import syntax: use xxx::prelude::*;. Unlike the std::prelude however those are not special-cased by the compiler and therefore require explicit importing.
The compiler is agnostic to the exact content of the prelude, therefore if one was to replace the std crate with their own (for example, in embedded development) then one would decide what goes into their std::prelude::v1 module.
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