1 // Copyright 2020, The Android Open Source Project
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //     http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 //! A macro that generates a message containing the current source file name
16 //! and line number.
17 
18 /// Generates a message containing the current source file name and line number.
19 ///
20 /// # Examples
21 ///
22 /// ```
23 /// source_location_msg!("Key is expired.");
24 /// Result:
25 /// "src/lib.rs:7 Key is expired."
26 /// ```
27 #[macro_export]
28 macro_rules! source_location_msg {
29     { $($arg:tt)+ } => {
30         format!("{}:{}: {}", file!(), line!(), format_args!($($arg)+))
31     };
32     {} => {
33         format!("{}:{}", file!(), line!())
34     };
35 }
36