mirror of
https://github.com/mimblewimble/grin.git
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117 lines
3.5 KiB
Rust
117 lines
3.5 KiB
Rust
// Copyright 2018 The Grin Developers
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Generic macros used here and there to simplify and make code more
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//! readable.
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/// Eliminates some of the verbosity in having iter and collect
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/// around every map call.
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#[macro_export]
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macro_rules! map_vec {
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($thing:expr, $mapfn:expr) => {
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$thing.iter().map($mapfn).collect::<Vec<_>>();
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};
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}
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/// Same as map_vec when the map closure returns Results. Makes sure the
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/// results are "pushed up" and wraps with a try.
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#[macro_export]
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macro_rules! try_map_vec {
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($thing:expr, $mapfn:expr) => {
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try_iter_map_vec!($thing.iter(), $mapfn);
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};
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}
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/// Same as try_map_vec when thing is an iterator
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#[macro_export]
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macro_rules! try_iter_map_vec {
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($thing:expr, $mapfn:expr) => {
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$thing.map($mapfn).collect::<Result<Vec<_>, _>>()?;
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};
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}
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/// Eliminates some of the verbosity in having iter and collect
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/// around every filter_map call.
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#[macro_export]
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macro_rules! filter_map_vec {
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($thing:expr, $mapfn:expr) => {
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$thing.iter().filter_map($mapfn).collect::<Vec<_>>();
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};
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}
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/// Allows the conversion of an expression that doesn't return anything to one
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/// that returns the provided identifier.
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/// Example:
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/// let foo = vec![1,2,3]
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/// println!(tee!(foo, foo.append(vec![3,4,5]))
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#[macro_export]
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macro_rules! tee {
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($thing:ident, $thing_expr:expr) => {{
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$thing_expr;
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$thing
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}};
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}
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/// Eliminate some of the boilerplate of deserialization (package ser) by
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/// passing just the list of reader function (with optional single param)
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/// Example before:
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/// let foo = try!(reader.read_u64());
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/// let bar = try!(reader.read_u32());
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/// let fixed_byte_var = try!(reader.read_fixed_bytes(64));
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/// Example after:
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/// let (foo, bar, fixed_byte_var) = ser_multiread!(reader, read_u64,
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/// read_u32, read_fixed_bytes(64));
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#[macro_export]
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macro_rules! ser_multiread {
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($rdr:ident, $($read_call:ident $(($val:expr)),*),*) => {
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( $(r#try!($rdr.$read_call($($val),*))),* )
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}
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}
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/// Eliminate some of the boilerplate of serialization (package ser) by
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/// passing directly pairs of writer function and data to write.
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/// Example before:
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/// try!(reader.write_u64(42));
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/// try!(reader.write_u32(100));
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/// Example after:
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/// ser_multiwrite!(writer, [write_u64, 42], [write_u32, 100]);
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#[macro_export]
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macro_rules! ser_multiwrite {
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($wrtr:ident, $([ $write_call:ident, $val:expr ]),* ) => {
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$( r#try!($wrtr.$write_call($val)) );*
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}
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}
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// don't seem to be able to define an Ord implementation for Hash due to
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// Ord being defined on all pointers, resorting to a macro instead
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macro_rules! hashable_ord {
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($hashable:ident) => {
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impl Ord for $hashable {
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fn cmp(&self, other: &$hashable) -> Ordering {
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self.hash().cmp(&other.hash())
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}
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}
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impl PartialOrd for $hashable {
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fn partial_cmp(&self, other: &$hashable) -> Option<Ordering> {
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Some(self.cmp(other))
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}
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}
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impl PartialEq for $hashable {
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fn eq(&self, other: &$hashable) -> bool {
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self.hash() == other.hash()
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}
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}
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impl Eq for $hashable {}
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};
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}
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