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#![no_std]
#![doc(html_root_url = "https://docs.rs/numid")]
#![warn(missing_docs)]
#[cfg(test)]
extern crate std;
#[cfg(feature = "display")]
#[doc(hidden)]
pub extern crate core as _core;
#[macro_export]
macro_rules! numid {
($(#[$attr:meta])* $vis:vis struct $name:ident) => {
numid!{$(#[$attr])* $vis struct $name(u64) -> 0}
};
($(#[$attr:meta])* $vis:vis struct $name:ident -> $init_val:expr) => {
numid!{$(#[$attr])* $vis struct $name(u64) -> $init_val}
};
($(#[$attr:meta])* $vis:vis struct $name:ident($ty:ty)) => {
numid!{$(#[$attr])* $vis struct $name($ty) -> 0}
};
($(#[$attr:meta])* $vis:vis struct $name:ident($ty:ty) -> $init_val:expr) => {
#[warn(non_camel_case_types)]
#[derive(Eq, PartialEq, Ord, PartialOrd, Clone, Copy, Hash, Debug)]
$(#[$attr])*
$vis struct $name($ty);
impl $name {
pub const INITIAL_VALUE: $ty = $init_val;
#[doc(hidden)]
#[inline]
unsafe fn __get_static_mut() -> &'static mut $ty {
static mut CURRENT_VALUE: $ty = $name::INITIAL_VALUE;
&mut CURRENT_VALUE
}
#[allow(dead_code)]
#[inline]
pub fn new() -> $name {
$name(unsafe {
let v = $name::__get_static_mut();
*v += 1;
*v
})
}
#[allow(dead_code)]
#[inline]
pub const fn value(self) -> $ty {
self.0
}
#[allow(dead_code)]
#[inline]
pub fn current_value() -> $ty {
unsafe {
*$name::__get_static_mut()
}
}
#[allow(dead_code)]
#[inline]
pub const fn initial_value() -> $ty {
$name::INITIAL_VALUE
}
#[allow(dead_code)]
pub fn replace_current_value(value: $ty) -> bool {
let cond = value > $name::current_value();
if cond {
unsafe {
let v = $name::__get_static_mut();
*v = value;
}
}
cond
}
#[allow(dead_code)]
#[inline]
pub fn create_maybe(value: $ty) -> Option<$name> {
if $name::replace_current_value(value) {
Some($name(value))
} else {
None
}
}
#[allow(dead_code)]
#[inline]
pub fn create_lower(value: $ty) -> $name {
assert!(value <= $name::initial_value());
$name(value)
}
}
impl Default for $name {
#[inline]
fn default() -> $name {
$name::new()
}
}
$crate::__display_numid!($name);
};
}
#[cfg(feature = "display")]
#[macro_export]
#[doc(hidden)]
macro_rules! __display_numid {
($name:ident) => {
impl $crate::_core::fmt::Display for $name {
#[inline]
fn fmt(&self, f: &mut $crate::_core::fmt::Formatter<'_>) -> $crate::_core::fmt::Result {
$crate::_core::fmt::Display::fmt(&self.0, f)
}
}
};
}
#[cfg(not(feature = "display"))]
#[macro_export]
#[doc(hidden)]
macro_rules! __display_numid {
($name:ident) => {};
}
#[cfg(feature = "example")]
pub mod example;
#[cfg(all(test, not(feature = "example")))]
mod example;
#[cfg(test)]
mod tests {
numid!(struct Id);
numid!(struct IdWithInitVal -> 100);
numid!(struct UnusedId(u32) -> 10);
#[test]
fn tests_id_used() {
assert_eq!(Id::initial_value(), 0);
assert_eq!(Id::current_value(), Id::initial_value());
let id0 = Id::new();
assert_eq!(Id::current_value(), 1);
assert_eq!(id0.value(), Id::current_value());
let id1 = Id::new();
assert_eq!(Id::current_value(), 2);
assert_eq!(id1.value(), Id::current_value());
assert_ne!(id0, id1);
assert!(id1 > id0);
let id2 = Id::default();
assert_eq!(Id::current_value(), 3);
assert_eq!(id2.value(), Id::current_value());
assert!(id2 > id1);
assert!(Id::replace_current_value(10));
assert_eq!(Id::current_value(), 10);
assert_eq!(Id::replace_current_value(1), false);
assert_eq!(Id::current_value(), 10);
let id3 = Id::new();
assert_eq!(id3.value(), 11);
}
#[test]
fn tests_id_with_init_val_used() {
assert_eq!(IdWithInitVal::initial_value(), 100);
assert_eq!(
IdWithInitVal::current_value(),
IdWithInitVal::initial_value()
);
let id0 = IdWithInitVal::new();
assert_eq!(IdWithInitVal::current_value(), 101);
assert_eq!(id0.value(), IdWithInitVal::current_value());
let id1 = IdWithInitVal::new();
assert_eq!(IdWithInitVal::current_value(), 102);
assert_eq!(id1.value(), IdWithInitVal::current_value());
assert!(id1 > id0);
assert!(IdWithInitVal::replace_current_value(150));
assert_eq!(IdWithInitVal::current_value(), 150);
assert_eq!(IdWithInitVal::replace_current_value(1), false);
assert_eq!(IdWithInitVal::current_value(), 150);
let id2 = IdWithInitVal::new();
assert_eq!(id2.value(), 151);
}
#[test]
fn tests_create_lower() {
let id = Id::create_lower(0);
assert_eq!(id.value(), 0);
let _ = IdWithInitVal::create_lower(0);
let _ = IdWithInitVal::create_lower(50);
let _ = IdWithInitVal::create_lower(100);
let _ = UnusedId::create_lower(5);
}
#[test]
#[should_panic]
fn tests_create_lower_fail() {
let _ = IdWithInitVal::create_lower(150);
}
#[test]
fn tests_create_maybe() {
numid!(struct IdMaybe -> 1);
assert_eq!(IdMaybe::create_maybe(5).unwrap().value(), 5);
assert_eq!(IdMaybe::current_value(), 5);
assert_eq!(IdMaybe::create_maybe(3), None);
assert_eq!(IdMaybe::current_value(), 5);
assert_eq!(IdMaybe::create_maybe(5), None);
assert_eq!(IdMaybe::create_maybe(8).unwrap().value(), 8);
}
#[test]
fn test_debug() {
numid!(struct IdDebug);
let id = IdDebug::new();
assert_eq!(std::format!("{:?}", id), "IdDebug(1)");
let idh = IdDebug::create_maybe(0x1b3d).unwrap();
assert_eq!(std::format!("{:x?}", idh), "IdDebug(1b3d)");
assert_eq!(std::format!("{:X?}", idh), "IdDebug(1B3D)");
}
#[cfg(feature = "display")]
#[test]
fn test_display() {
numid!(struct IdDisplay);
let id = IdDisplay::new();
assert_eq!(std::format!("{}", id), "1");
}
mod submodule {
numid!(pub struct PublicId);
numid!(struct PrivateId);
#[test]
fn test_private() {
let _ = PrivateId::new();
}
}
#[test]
fn test_public() {
let _ = submodule::PublicId::new();
}
#[test]
fn test_pub_crate() {
mod module {
numid!(pub (crate) struct Test -> 4);
}
assert_eq!(module::Test::current_value(), 4);
}
#[test]
fn test_pub_in_module() {
mod module {
mod submodule {
numid!(
pub (in super) struct Test -> 7
);
}
mod test {
pub(super) fn value() -> u64 {
super::submodule::Test::current_value()
}
}
pub fn value() -> u64 {
test::value()
}
}
assert_eq!(module::value(), 7);
}
}