Q# Structs

Q# structs are a way to organize your code.

Declaration Syntax

Structs can be declared in the same scopes as callables by using the struct keyword. They have a name and use curly braces to list our named fields.

struct Foo {
    First : Int,
    Second : Double,
}

Construction Syntax

To construct a declared struct, use the new keyword with the struct type name and curly braces to list out the field assignments.

let foo = new Foo { First = 3, Second = 4.5 };

There is also a copy-constructor syntax that is very similar to the regular constructor syntax. When listing field assignments, you first list the existing struct object to copy from preceded by .... When copying, you only list out the field assignments you want to change during the copying.

let bar = new Foo { ...foo, Second = 6.5 };

Field Accessor Syntax

To access the field members of a struct object, the . operator is used.

let x = bar.First;