How to define a command only available for a certain filetype.

Hi everyone!

I want to define a command only available for a certain filetype, for
example cpp filetype:

1. The command is available when the current buffer is cpp filetype.
2. The command is undefined if I didn't open cpp file, or the current
buffer is not cpp filetype.
Because I want this command invisiable if it not wanted.
3. The suffix of C++ file can be .cc .cPP .CPP .Cpp .h ..... The
command should be available all kind of cpp files.

How to do this? Many thanks in advance.

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