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# Logging macros
Additional messages can be logged during a test case.
## Streaming macros
All these macros allow heterogenous sequences of values to be streaming using the insertion operator (```<<```) in the same way that std::ostream, std::cout, etc support it.
E.g.:
```c++
INFO( "The number is " << i );
```
(Note that there is no initial ```<<``` - instead the insertion sequence is placed in parentheses.)
These macros come in three forms:
**INFO(** _message expression_ **)**
The message is logged to a buffer, but only reported with the next assertion that is logged. This allows you to log contextual information in case of failures which is not shown during a successful test run (for the console reporter, without -s). Messages are removed from the buffer at the end of their scope, so may be used, for example, in loops.
**WARN(** _message expression_ **)**
The message is always reported but does not fail the test.
**FAIL(** _message expression_ **)**
The message is reported and the test case fails.
## Quickly capture a variable value
**CAPTURE(** _expression_ **)**
Sometimes you just want to log the name and value of a variable. While you can easily do this with the INFO macro, above, as a convenience the CAPTURE macro handles the stringising of the variable name for you (actually it works with any expression, not just variables).
E.g.
```c++
CAPTURE( theAnswer );
```
This would log something like:
<pre>"theAnswer := 42"</pre>
## Deprecated macros
**SCOPED_INFO and SCOPED_CAPTURE**
These macros are now deprecated and are just aliases for INFO and CAPTURE (which were not previously scoped).
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