openethereum/util/macros/src/lib.rs

// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.

// Parity Ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity Ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

//! Utils common types and macros global reexport.

use std::io;

#[macro_export]
macro_rules! vec_into {
	( $( $x:expr ),* ) => {
		vec![ $( $x.into() ),* ]
	}
}

#[macro_export]
macro_rules! slice_into {
	( $( $x:expr ),* ) => {
		&[ $( $x.into() ),* ]
	}
}

#[macro_export]
macro_rules! hash_map {
	() => { HashMap::new() };
	( $( $x:expr => $y:expr ),* ) => {{
		let mut x = HashMap::new();
		$(
			x.insert($x, $y);
		)*
		x
	}}
}

#[macro_export]
macro_rules! map {
	() => { BTreeMap::new() };
	( $( $x:expr => $y:expr ),* ) => {{
		let mut x = BTreeMap::new();
		$(
			x.insert($x, $y);
		)*
		x
	}}
}

#[macro_export]
macro_rules! flush {
	($arg:expr) => ($crate::flush($arg.into()));
	($($arg:tt)*) => ($crate::flush(format!("{}", format_args!($($arg)*))));
}

#[macro_export]
macro_rules! flushln {
	($fmt:expr) => (flush!(concat!($fmt, "\n")));
	($fmt:expr, $($arg:tt)*) => (flush!(concat!($fmt, "\n"), $($arg)*));
}

#[doc(hidden)]
pub fn flush(s: String) {
	let _ = io::Write::write(&mut io::stdout(), s.as_bytes());
	let _ = io::Write::flush(&mut io::stdout());
}

#[test]
fn test_flush() {
	flushln!("hello_world {:?}", 1);
}