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add empty rule to map macros

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This commit is contained in:
Robert Habermeier
2016-05-31 21:18:54 +02:00
parent ec7af964ab
commit 4146e1f02b
1 changed files with 4 additions and 0 deletions
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4
util/src/common.rs
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@@ -26,6 +26,7 @@ pub use sha3::*;
#[macro_export] #[macro_export]
macro_rules! hash_map { macro_rules! hash_map {
() => { HashMap::new() };
( $( $x:expr => $y:expr ),* ) => {{ ( $( $x:expr => $y:expr ),* ) => {{
let mut x = HashMap::new(); let mut x = HashMap::new();
$( $(
@@ -37,6 +38,7 @@ macro_rules! hash_map {
#[macro_export] #[macro_export]
macro_rules! hash_map_into { macro_rules! hash_map_into {
() => { HashMap::new() };
( $( $x:expr => $y:expr ),* ) => {{ ( $( $x:expr => $y:expr ),* ) => {{
let mut x = HashMap::new(); let mut x = HashMap::new();
$( $(
@@ -48,6 +50,7 @@ macro_rules! hash_map_into {
#[macro_export] #[macro_export]
macro_rules! map { macro_rules! map {
() => { BTreeMap::new() };
( $( $x:expr => $y:expr ),* ) => {{ ( $( $x:expr => $y:expr ),* ) => {{
let mut x = BTreeMap::new(); let mut x = BTreeMap::new();
$( $(
@@ -59,6 +62,7 @@ macro_rules! map {
#[macro_export] #[macro_export]
macro_rules! map_into { macro_rules! map_into {
() => { BTreeMap::new() };
( $( $x:expr => $y:expr ),* ) => {{ ( $( $x:expr => $y:expr ),* ) => {{
let mut x = BTreeMap::new(); let mut x = BTreeMap::new();
$( $(