Penitential lamentation, intimate conversation with God, the friend and help-meet of life sighs of disappointed friendship and love lie in its radius. It cannot laugh, but it can smile it cannot howl, but it can at least grimace its crying.-Consequently only unusual characters and feelings can be brought out in this key. All languishing, longing, sighing of the love-sick soul lies in this key.Ī leering key, degenerating into grief and rapture. Its character is: innocence, simplicity, naïvety, children's talk.ĭeclaration of love and at the same time the lament of unhappy love. (See Piano's Ivory Cage) One of the most influential descriptions of characteristics shared in German-speaking cultures in the late 18th and early 19th century was from from Christian Schubart's Ideen zu einer Aesthetik der Tonkunst (1806):Ĭompletely Pure. When equal temperament became the dominant tuning after 1917, the aural quality of every key became the same, and therefore these affective characteristics are mostly lost to us. Although these characteristics were, of course, subjective, it was possible to conceive of each key as unique because each key actually sounded distinct within unequal temperaments. We lose a part of the meaning of their music if we are ignorant of their affective choices. When Mozart or Beethoven or Schubert wrote a piece in a Ab major, for example, they were well aware of this was the 'key of the grave' and knew that many in their audiences were as well. It was part of the shared cultural experience of those who made, performed and listened to music. REF '18 Only works inside async.Įffectively converts any IntoFuture STD type into proper future first.The association of musical keys with specific emotional or qualitative characteristic was fairly common prior to the 20th century. Syntactic sugar to get future, poll, yield. If x is Err or None, return and propagate. Same but instead of this loop, enclosing loop marked with 'label. Same, but make x the value of the enclosing loop marked with 'label.Ĭontinue expression REF to the next loop iteration of this loop. Same, but make x value of the loop expression (only in actual loop).Įxit not only this loop, but the enclosing one marked with 'label. ![]() Loop label, EX REF useful for flow control in nested loops. On proper Iterator STD then x = next() until exhausted (first None).Ĭonditional branch REF if expression is true. BK STD REFĮffectively converts any IntoIterator STD type into proper iterator first. Loop, REF run while expression x is true. Guarantees S is well-behaved w.r.t T people may use T on S safely.Ĭontrol execution within a function. Guarantees to compiler " I have checked requirements, trust me". of T can cause UB implementor must check". Means " calling can cause UB, ↓ YOU must check requirements". If you enjoy debugging segfaults Friday night unsafe code. Move closure REF taking ownership i.e., y transferred into closure.Ĭlosures sometimes look like logical ORs (here: return a closure). Same, without block expression may only consist of single expression. algebraic data types, tagged unions.ĭefine variants of enum can be unit- A, tuple- B () and struct-like C an impl Future.įunction pointers, BK STD REF memory holding address of a callable.Ĭallable Trait BK STD (also FnMut, FnOnce), implemented by closures, fn's …Ī closure BK EX REF that borrows its captures, ↓ REF (e.g., a local variable).Ĭlosure accepting one argument named x, body is block expression. Occupies no space, optimized away.ĭefine an enum, BK EX REF c. ![]() 0 of type T.ĭefine zero sized NOM unit struct. Exampleĭefine a struct BK EX STD REF with named fields.ĭefine struct with named field x of type T.ĭefine "tupled" struct with numbered field. ![]() Data Structures urlĭata types and memory locations defined via keywords. Opinion □ - If you have never seen or used any Rust it might be good to visit one of the links above before continuing the next chapter might feel a bit terse otherwise. ![]() In addition, have a look at the usual suspects.
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