[#LDBG_OS]
= LDBG_OS
:mrdocs:

LDBG_OS() is a macro that behaves like LDBG() but instead of directly using it to stream the output, it takes a callback function that will be called with a raw_ostream. This is useful when you need to pass a `raw_ostream` to a helper function to be able to print (when the `<<` operator is not available).

== Synopsis

Declared in `<llvm/Support/DebugLog.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
#define LDBG_OS(...)

----

== Description

E.g., LDBG_OS([&]&Os) { Os << "Pass Manager contains: "; pm.printAsTextual(Os); });

Just like LDBG(), it optionally accepts a `level` and `type` arguments. E.g., LDBG_OS(2, [&]&Os) { ... }); LDBG_OS("debug_type", [&]&Os) { ... }); LDBG_OS("debug_type", 2, [&]&Os) { ... });


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