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| author | Philipp Brüschweiler <blei42@gmail.com> | 2013-12-02 21:47:57 +0100 |
|---|---|---|
| committer | Philipp Brüschweiler <blei42@gmail.com> | 2013-12-02 21:47:57 +0100 |
| commit | a75f72d45a1c1399adab0e123acdb76582a360ae (patch) | |
| tree | 5f99ea6941e8bebb6b7950f4b0adec6edc392faf /src/libsyntax/ext/expand.rs | |
| parent | 61443dc1f5089df637edba83587b9f3020063266 (diff) | |
| download | rust-a75f72d45a1c1399adab0e123acdb76582a360ae.tar.gz rust-a75f72d45a1c1399adab0e123acdb76582a360ae.zip | |
Add a macro to check if logging at a given label is enabled
This is useful when the information that is needed to do useful logging is expensive to produce.
Diffstat (limited to 'src/libsyntax/ext/expand.rs')
| -rw-r--r-- | src/libsyntax/ext/expand.rs | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs index acf0326aefd..1d040c10984 100644 --- a/src/libsyntax/ext/expand.rs +++ b/src/libsyntax/ext/expand.rs @@ -754,6 +754,13 @@ pub fn std_macros() -> @str { if cfg!(not(ndebug)) { log!(4u32, $($arg)*) } )) + macro_rules! log_enabled( + ($lvl:expr) => ( { + let lvl = $lvl; + lvl <= __log_level() && (lvl != 4 || cfg!(not(ndebug))) + } ) + ) + macro_rules! fail( () => ( fail!("explicit failure") |