How to add comments to fenced code block within doxygen documentation - documentation

Question

I am using fenced code blocks in Doxygen using the markdown syntax. This makes it easy to add a simple code example, like this:
~~~~~{.cpp}
void doSomething()
{
}
~~~~~
When I try to add comments into the fenced code block using two forward slashes, Doxygen seems to remove the slashes. So when I write this:
~~~~~{.cpp}
void doSomething()
{
// This function should do something
}
~~~~~
I get this output:
void doSomething()
{
This function should do something
}
How can I tell Doxygen to keep the comments in the fenced code block?
EDIT:
The complete file looks like this (we use the standard Doxygen extension of .dox for documentation-only files):
/*!
\page PATTERN_SAMPLE Sample
~~~~~{.cpp}
void doSomething()
{
// This function should do something
}
~~~~~
*/
The result looks like this:

Answer 1

Try with \code
\code{.cpp}
class Cpp {};
\endcode

Answer 2

I encountered the same issue. No need to change code format. You can specify STRIP_CODE_COMMENTS as NO: this setting outputs the source code with the comment.
# Setting the STRIP_CODE_COMMENTS tag to YES will instruct doxygen to hide any
# special comment blocks from generated source code fragments. Normal, C++ and
# Fortran comments will always remain visible.
# The default value is: YES.
STRIP_CODE_COMMENTS = NO