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/target
/Cargo.lock

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language: rust
sudo: false
script:
- cargo build --verbose
- cargo test --verbose
- cargo doc
after_success: |
[ $TRAVIS_BRANCH = master ] &&
[ $TRAVIS_PULL_REQUEST = false ] &&
echo '<meta http-equiv=refresh content=0;url=bitflags/index.html>' > target/doc/index.html &&
pip install ghp-import --user $USER &&
$HOME/.local/bin/ghp-import -n target/doc &&
git push -qf https://${TOKEN}@github.com/${TRAVIS_REPO_SLUG}.git gh-pages
env:
global:
secure: OiQj6NSyu634pS+qWCAeaibuBdiRsDMz5k0bi8hhdom3W24L8I9KkdWlBm2K8Ef97Uzgg6Xsr7LSWX0CONxX2eU3QaB1v3mXNxModa7ftW/w9y7B8MThxS5nRTUmHZC17OvoQ3EoNyrktnTAkyIr0E0YxBruJYAi4EH+54guRN8=
notifications:
email:
on_success: never

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[package]
name = "bitflags"
version = "0.1.0"
authors = ["The Rust Project Developers"]
license = "MIT/Apache-2.0"
readme = "README.md"
repository = "https://github.com/rust-lang/bitflags"
homepage = "https://github.com/rust-lang/bitflags"
documentation = "http://doc.rust-lang.org/bitflags"
description = """
A macro to generate structures which behave like bitflags.
"""

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bitflags
========
A Rust macro to generate structures which behave like a set of bitflags
[![Build Status](https://travis-ci.org/rust-lang/bitflags.svg?branch=master)](https://travis-ci.org/rust-lang/bitflags)
[Documentation](http://doc.rust-lang.org/bitflags)
## Usage
Add this to your `Cargo.toml`:
```toml
[dependencies]
bitflags = "0.1"
```
and this to your crate root:
```rust
#[macro_use]
extern crate bitflags;
```

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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! A typesafe bitmask flag generator.
/// The `bitflags!` macro generates a `struct` that holds a set of C-style
/// bitmask flags. It is useful for creating typesafe wrappers for C APIs.
///
/// The flags should only be defined for integer types, otherwise unexpected
/// type errors may occur at compile time.
///
/// # Example
///
/// ```{.rust}
/// bitflags! {
/// flags Flags: u32 {
/// const FLAG_A = 0b00000001,
/// const FLAG_B = 0b00000010,
/// const FLAG_C = 0b00000100,
/// const FLAG_ABC = FLAG_A.bits
/// | FLAG_B.bits
/// | FLAG_C.bits,
/// }
/// }
///
/// fn main() {
/// let e1 = FLAG_A | FLAG_C;
/// let e2 = FLAG_B | FLAG_C;
/// assert!((e1 | e2) == FLAG_ABC); // union
/// assert!((e1 & e2) == FLAG_C); // intersection
/// assert!((e1 - e2) == FLAG_A); // set difference
/// assert!(!e2 == FLAG_A); // set complement
/// }
/// ```
///
/// The generated `struct`s can also be extended with type and trait implementations:
///
/// ```{.rust}
/// use std::fmt;
///
/// bitflags! {
/// flags Flags: u32 {
/// const FLAG_A = 0b00000001,
/// const FLAG_B = 0b00000010,
/// }
/// }
///
/// impl Flags {
/// pub fn clear(&mut self) {
/// self.bits = 0; // The `bits` field can be accessed from within the
/// // same module where the `bitflags!` macro was invoked.
/// }
/// }
///
/// impl fmt::Show for Flags {
/// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
/// write!(f, "hi!")
/// }
/// }
///
/// fn main() {
/// let mut flags = FLAG_A | FLAG_B;
/// flags.clear();
/// assert!(flags.is_empty());
/// assert_eq!(format!("{:?}", flags).as_slice(), "hi!");
/// }
/// ```
///
/// # Attributes
///
/// Attributes can be attached to the generated `struct` by placing them
/// before the `flags` keyword.
///
/// # Derived traits
///
/// The `PartialEq` and `Clone` traits are automatically derived for the `struct` using
/// the `deriving` attribute. Additional traits can be derived by providing an
/// explicit `deriving` attribute on `flags`.
///
/// # Operators
///
/// The following operator traits are implemented for the generated `struct`:
///
/// - `BitOr`: union
/// - `BitAnd`: intersection
/// - `BitXor`: toggle
/// - `Sub`: set difference
/// - `Not`: set complement
///
/// # Methods
///
/// The following methods are defined for the generated `struct`:
///
/// - `empty`: an empty set of flags
/// - `all`: the set of all flags
/// - `bits`: the raw value of the flags currently stored
/// - `from_bits`: convert from underlying bit representation, unless that
/// representation contains bits that do not correspond to a flag
/// - `from_bits_truncate`: convert from underlying bit representation, dropping
/// any bits that do not correspond to flags
/// - `is_empty`: `true` if no flags are currently stored
/// - `is_all`: `true` if all flags are currently set
/// - `intersects`: `true` if there are flags common to both `self` and `other`
/// - `contains`: `true` all of the flags in `other` are contained within `self`
/// - `insert`: inserts the specified flags in-place
/// - `remove`: removes the specified flags in-place
/// - `toggle`: the specified flags will be inserted if not present, and removed
/// if they are.
#[macro_export]
macro_rules! bitflags {
($(#[$attr:meta])* flags $BitFlags:ident: $T:ty {
$($(#[$Flag_attr:meta])* const $Flag:ident = $value:expr),+
}) => {
#[derive(Copy, PartialEq, Eq, Clone, PartialOrd, Ord, Hash)]
$(#[$attr])*
pub struct $BitFlags {
bits: $T,
}
$($(#[$Flag_attr])* pub const $Flag: $BitFlags = $BitFlags { bits: $value };)+
impl $BitFlags {
/// Returns an empty set of flags.
#[inline]
pub fn empty() -> $BitFlags {
$BitFlags { bits: 0 }
}
/// Returns the set containing all flags.
#[inline]
pub fn all() -> $BitFlags {
$BitFlags { bits: $($value)|+ }
}
/// Returns the raw value of the flags currently stored.
#[inline]
pub fn bits(&self) -> $T {
self.bits
}
/// Convert from underlying bit representation, unless that
/// representation contains bits that do not correspond to a flag.
#[inline]
pub fn from_bits(bits: $T) -> ::std::option::Option<$BitFlags> {
if (bits & !$BitFlags::all().bits()) != 0 {
::std::option::Option::None
} else {
::std::option::Option::Some($BitFlags { bits: bits })
}
}
/// Convert from underlying bit representation, dropping any bits
/// that do not correspond to flags.
#[inline]
pub fn from_bits_truncate(bits: $T) -> $BitFlags {
$BitFlags { bits: bits } & $BitFlags::all()
}
/// Returns `true` if no flags are currently stored.
#[inline]
pub fn is_empty(&self) -> bool {
*self == $BitFlags::empty()
}
/// Returns `true` if all flags are currently set.
#[inline]
pub fn is_all(&self) -> bool {
*self == $BitFlags::all()
}
/// Returns `true` if there are flags common to both `self` and `other`.
#[inline]
pub fn intersects(&self, other: $BitFlags) -> bool {
!(*self & other).is_empty()
}
/// Returns `true` all of the flags in `other` are contained within `self`.
#[inline]
pub fn contains(&self, other: $BitFlags) -> bool {
(*self & other) == other
}
/// Inserts the specified flags in-place.
#[inline]
pub fn insert(&mut self, other: $BitFlags) {
self.bits |= other.bits;
}
/// Removes the specified flags in-place.
#[inline]
pub fn remove(&mut self, other: $BitFlags) {
self.bits &= !other.bits;
}
/// Toggles the specified flags in-place.
#[inline]
pub fn toggle(&mut self, other: $BitFlags) {
self.bits ^= other.bits;
}
}
impl ::std::ops::BitOr for $BitFlags {
type Output = $BitFlags;
/// Returns the union of the two sets of flags.
#[inline]
fn bitor(self, other: $BitFlags) -> $BitFlags {
$BitFlags { bits: self.bits | other.bits }
}
}
impl ::std::ops::BitXor for $BitFlags {
type Output = $BitFlags;
/// Returns the left flags, but with all the right flags toggled.
#[inline]
fn bitxor(self, other: $BitFlags) -> $BitFlags {
$BitFlags { bits: self.bits ^ other.bits }
}
}
impl ::std::ops::BitAnd for $BitFlags {
type Output = $BitFlags;
/// Returns the intersection between the two sets of flags.
#[inline]
fn bitand(self, other: $BitFlags) -> $BitFlags {
$BitFlags { bits: self.bits & other.bits }
}
}
impl ::std::ops::Sub for $BitFlags {
type Output = $BitFlags;
/// Returns the set difference of the two sets of flags.
#[inline]
fn sub(self, other: $BitFlags) -> $BitFlags {
$BitFlags { bits: self.bits & !other.bits }
}
}
impl ::std::ops::Not for $BitFlags {
type Output = $BitFlags;
/// Returns the complement of this set of flags.
#[inline]
fn not(self) -> $BitFlags {
$BitFlags { bits: !self.bits } & $BitFlags::all()
}
}
};
($(#[$attr:meta])* flags $BitFlags:ident: $T:ty {
$($(#[$Flag_attr:meta])* const $Flag:ident = $value:expr),+,
}) => {
bitflags! {
$(#[$attr])*
flags $BitFlags: $T {
$($(#[$Flag_attr])* const $Flag = $value),+
}
}
};
}
#[cfg(test)]
#[allow(non_upper_case_globals)]
mod tests {
use std::hash::{self, SipHasher};
bitflags! {
#[doc = "> The first principle is that you must not fool yourself — and"]
#[doc = "> you are the easiest person to fool."]
#[doc = "> "]
#[doc = "> - Richard Feynman"]
flags Flags: u32 {
const FlagA = 0b00000001,
#[doc = "<pcwalton> macros are way better at generating code than trans is"]
const FlagB = 0b00000010,
const FlagC = 0b00000100,
#[doc = "* cmr bed"]
#[doc = "* strcat table"]
#[doc = "<strcat> wait what?"]
const FlagABC = FlagA.bits
| FlagB.bits
| FlagC.bits,
}
}
bitflags! {
flags AnotherSetOfFlags: i8 {
const AnotherFlag = -1_i8,
}
}
#[test]
fn test_bits(){
assert_eq!(Flags::empty().bits(), 0b00000000);
assert_eq!(FlagA.bits(), 0b00000001);
assert_eq!(FlagABC.bits(), 0b00000111);
assert_eq!(AnotherSetOfFlags::empty().bits(), 0b00);
assert_eq!(AnotherFlag.bits(), !0_i8);
}
#[test]
fn test_from_bits() {
assert!(Flags::from_bits(0) == Some(Flags::empty()));
assert!(Flags::from_bits(0b1) == Some(FlagA));
assert!(Flags::from_bits(0b10) == Some(FlagB));
assert!(Flags::from_bits(0b11) == Some(FlagA | FlagB));
assert!(Flags::from_bits(0b1000) == None);
assert!(AnotherSetOfFlags::from_bits(!0_i8) == Some(AnotherFlag));
}
#[test]
fn test_from_bits_truncate() {
assert!(Flags::from_bits_truncate(0) == Flags::empty());
assert!(Flags::from_bits_truncate(0b1) == FlagA);
assert!(Flags::from_bits_truncate(0b10) == FlagB);
assert!(Flags::from_bits_truncate(0b11) == (FlagA | FlagB));
assert!(Flags::from_bits_truncate(0b1000) == Flags::empty());
assert!(Flags::from_bits_truncate(0b1001) == FlagA);
assert!(AnotherSetOfFlags::from_bits_truncate(0_i8) == AnotherSetOfFlags::empty());
}
#[test]
fn test_is_empty(){
assert!(Flags::empty().is_empty());
assert!(!FlagA.is_empty());
assert!(!FlagABC.is_empty());
assert!(!AnotherFlag.is_empty());
}
#[test]
fn test_is_all() {
assert!(Flags::all().is_all());
assert!(!FlagA.is_all());
assert!(FlagABC.is_all());
assert!(AnotherFlag.is_all());
}
#[test]
fn test_two_empties_do_not_intersect() {
let e1 = Flags::empty();
let e2 = Flags::empty();
assert!(!e1.intersects(e2));
assert!(AnotherFlag.intersects(AnotherFlag));
}
#[test]
fn test_empty_does_not_intersect_with_full() {
let e1 = Flags::empty();
let e2 = FlagABC;
assert!(!e1.intersects(e2));
}
#[test]
fn test_disjoint_intersects() {
let e1 = FlagA;
let e2 = FlagB;
assert!(!e1.intersects(e2));
}
#[test]
fn test_overlapping_intersects() {
let e1 = FlagA;
let e2 = FlagA | FlagB;
assert!(e1.intersects(e2));
}
#[test]
fn test_contains() {
let e1 = FlagA;
let e2 = FlagA | FlagB;
assert!(!e1.contains(e2));
assert!(e2.contains(e1));
assert!(FlagABC.contains(e2));
assert!(AnotherFlag.contains(AnotherFlag));
}
#[test]
fn test_insert(){
let mut e1 = FlagA;
let e2 = FlagA | FlagB;
e1.insert(e2);
assert!(e1 == e2);
let mut e3 = AnotherSetOfFlags::empty();
e3.insert(AnotherFlag);
assert!(e3 == AnotherFlag);
}
#[test]
fn test_remove(){
let mut e1 = FlagA | FlagB;
let e2 = FlagA | FlagC;
e1.remove(e2);
assert!(e1 == FlagB);
let mut e3 = AnotherFlag;
e3.remove(AnotherFlag);
assert!(e3 == AnotherSetOfFlags::empty());
}
#[test]
fn test_operators() {
let e1 = FlagA | FlagC;
let e2 = FlagB | FlagC;
assert!((e1 | e2) == FlagABC); // union
assert!((e1 & e2) == FlagC); // intersection
assert!((e1 - e2) == FlagA); // set difference
assert!(!e2 == FlagA); // set complement
assert!(e1 ^ e2 == FlagA | FlagB); // toggle
let mut e3 = e1;
e3.toggle(e2);
assert!(e3 == FlagA | FlagB);
let mut m4 = AnotherSetOfFlags::empty();
m4.toggle(AnotherSetOfFlags::empty());
assert!(m4 == AnotherSetOfFlags::empty());
}
#[test]
fn test_lt() {
let mut a = Flags::empty();
let mut b = Flags::empty();
assert!(!(a < b) && !(b < a));
b = FlagB;
assert!(a < b);
a = FlagC;
assert!(!(a < b) && b < a);
b = FlagC | FlagB;
assert!(a < b);
}
#[test]
fn test_ord() {
let mut a = Flags::empty();
let mut b = Flags::empty();
assert!(a <= b && a >= b);
a = FlagA;
assert!(a > b && a >= b);
assert!(b < a && b <= a);
b = FlagB;
assert!(b > a && b >= a);
assert!(a < b && a <= b);
}
#[test]
fn test_hash() {
let mut x = Flags::empty();
let mut y = Flags::empty();
assert!(hash::hash::<Flags, SipHasher>(&x) == hash::hash::<Flags, SipHasher>(&y));
x = Flags::all();
y = FlagABC;
assert!(hash::hash::<Flags, SipHasher>(&x) == hash::hash::<Flags, SipHasher>(&y));
}
}