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Numbers now define how many bytes it takes to represent them.

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Numbers now have an associated constant value that defines how many
bytes it takes to define them.
This commit is contained in:
Jason Travis Smith 2016-01-06 00:54:44 -05:00
parent 902aeb5dbe
commit 946ad90fa0
1 changed files with 17 additions and 2 deletions
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19
src/number.rs
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@ -1,3 +1,5 @@
use std::{u8, u16, u32, u64, usize};
use std::{i8, i16, i32, i64, isize};
use std::cmp::PartialEq; use std::cmp::PartialEq;
use std::mem::size_of; use std::mem::size_of;
use std::num::{Zero, One}; use std::num::{Zero, One};
@ -15,6 +17,11 @@ pub trait Number : Zero + One + Add<Output=Self> + Sub<Output=Self> +
{ {
type StrRadixError; type StrRadixError;
/// The amount of Bytes required to represent this Number.
const BYTES: u8;
/// Create a number from a given string and base radix. /// Create a number from a given string and base radix.
/// ///
///``` ///```
@ -749,6 +756,10 @@ macro_rules! int_number_trait_impl
{ {
type StrRadixError = ::std::num::ParseIntError; type StrRadixError = ::std::num::ParseIntError;
const BYTES: u8 = <$varType>::BYTES;
fn from_str_radix(src: &str, radix: u32) -> fn from_str_radix(src: &str, radix: u32) ->
Result<Self, ::std::num::ParseIntError> Result<Self, ::std::num::ParseIntError>
{ {
@ -762,12 +773,16 @@ macro_rules! int_number_trait_impl
/// base float types in rust. /// base float types in rust.
macro_rules! float_number_trait_impl macro_rules! float_number_trait_impl
{ {
($traitName: ident for $($varType: ty)*) => ($traitName: ident for $($varType: ty, $numBytes: expr)*) =>
($( ($(
impl $traitName for $varType impl $traitName for $varType
{ {
type StrRadixError = ::std::num::ParseFloatError; type StrRadixError = ::std::num::ParseFloatError;
const BYTES: u8 = $numBytes;
fn from_str_radix(src: &str, radix: u32) -> fn from_str_radix(src: &str, radix: u32) ->
Result<Self, ::std::num::ParseFloatError> Result<Self, ::std::num::ParseFloatError>
{ {
@ -787,7 +802,7 @@ macro_rules! float_number_trait_impl
// Implement the Number trait for the types that are Numbers. // Implement the Number trait for the types that are Numbers.
int_number_trait_impl!(Number for u8 u16 u32 u64 usize); int_number_trait_impl!(Number for u8 u16 u32 u64 usize);
int_number_trait_impl!(Number for i8 i16 i32 i64 isize); int_number_trait_impl!(Number for i8 i16 i32 i64 isize);
float_number_trait_impl!(Number for f32 f64); float_number_trait_impl!(Number for f32, 4 f64, 8);
// Implement the ToNumber and FromNumber traits for // Implement the ToNumber and FromNumber traits for
// the types that are Numbers. The FromNumber trait needs // the types that are Numbers. The FromNumber trait needs