misc cast

[timotheecour]

links

add UFCS/MCS cast, and addrCast by timotheecour · Pull Request #28 · nim-lang/fusion

C++: reinterpret_cast v.s. static_cast and memory layout difference | by Xianbo QIAN | Medium

c++ - When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used? - Stack Overflow

[juancarlospaco]

The only way to make a Tuple type without any extra unwanted temporary variable is cast,
maybe a template can improve the usability, even if using cast internally.

type A = tuple[a: string, b: int]
echo A(a: "a",  b: 9)  # Error: object constructor needs an object type

type A = tuple[a: string, b: int]
var x: A = (a: "a",  b: 9)  # Unwanted temporary variable.
echo x                      # Works

type A = tuple[a: string, b: int]
echo cast[A]((a: "a",  b: 9))  # Works but uses cast

🤔

[timotheecour]

The only way to make a Tuple type without any extra unwanted temporary variable is cast

see nim-lang/RFCs#321 which would enable echo A(a: "a", b: 9)

[SolitudeSF]

The only way to make a Tuple type without any extra unwanted temporary variable is cast,

type A = tuple[a: string, b: int]
echo A (a: "a",  b: 9)

[timotheecour]

or this works too:

type A = tuple[a: string, b: int]
echo A (a: "a",  b: 9)
echo A((a: "a",  b: 9))