Macro storage_types

macro_rules! storage_types {
    ($(#[$attr:meta])* types: $($T:ident),+; $($tt:tt)*) => { ... };
    ($(#[$attr:meta])* pub types: $($T:ident),+; $($tt:tt)*) => { ... };
    (@types $attr:tt @$M:ident $($T:ident),+; $tt:tt) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident usize ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident u8 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident u16 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident u32 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident u64 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident u128 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident isize ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident i8 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident i16 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident i32 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident i64 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident i128 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident BigInt ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident BigUint ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident Rational ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident Rational32 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident Rational64 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident BigRational ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident Complex32 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident Complex64 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident f32 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident f64 ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident All ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident PrimInt ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident Ratio ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident Float ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident Signed ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident Unsigned ($($tt:tt)*)) => { ... };
    (@type ($(#[$attr:meta])*) @$M:ident Complex ($($tt:tt)*)) => { ... };
    (@mod ($(#[$attr:meta])*) $M:ident, $V:ty; ($($tt:tt)*)) => { ... };
    (@pub_mod ($(#[$attr:meta])*) $M:ident, $V:ty; ($($tt:tt)*)) => { ... };
    ($($tt:tt)*) => { ... };
}

Macro to duplicate code on a per-storage type basis. The given code is duplicated in new modules named for each storage type. A type alias, V, is generated that code can use for the type. @... match arms are considered private.

• $attr: Module attributes. Generally used to set documentation comments for storage type modules generated by the macro.
• $T: Types to generate a module for. Accepts all underlying storage types along with a number of different categories:
  • All: usize, u8, u16, u32, u64, u128, isize, i8, i16, i32, i64, i128, BigInt, BigUint, Rational, Rational32, Rational64, BigRational, Complex32, Complex64, f32, and f64.
  • PrimInt: usize, u8, u16, u32, u64, u128, isize, i8, i16, i32, i64, and i128.
  • Ratio: Rational, Rational32, Rational64, and BigRational.
  • Float: f32 and f64.
  • Signed: isize, i8, i16, i32, i64, i128, BigInt, Rational, Rational32, Rational64, BigRational, f32, and f64.
  • Unsigned: usize, u8, u16, u32, u64, u128, and BigUint.
  • Complex: Complex32 and Complex64.
• $tt: Code to place into each storage type module.

#[macro_use]
extern crate uom;

fn main() {
   f32::do_work(1.234_f32);
   f64::do_work(1.234_f64);
}

storage_types! {
   /// Type modules.
   pub types: Float;

   pub fn do_work(_v: V) {}
}