syntax highlight error when language-c treat a C++ .h file as a C .h file

[skywind3000]

most header file of C++ has the '.h' suffix, which is treated as a C header file. As a consequence of this, many C++ keywords (class, public, private, template) in the .h file get a wrong highlight.

In a ordinary .cpp file, everything in color is alright:

After putting same piece of code to the .h file, color got issues:

Using ctrl-shift-L to change grammar, I found .h file has been recognized as a C file by default. After changing the grammar to C++, it still has a problem around 'class':

Every C++ keywords in .h files is supposed to be recognized,
it seems there are two issues here:

1. The .h file hasn't been treated as a cpp header file by default.
2. Keywords in .h files can not be recognized after changing the file grammar to C++.

---

It's very werid syntax highlight: keyword 'class' hasn't be recognized:

everything get alright if a single simicolon is added after 'NAMESPACE_BEGIN' in line 1.

After removing the simicolon and add the definition of NAMESPACE_BEGIN/END, I find syntax highlight error in '#endif' of line 3 but 'class' seems correct now !

[oulrich1]

This problem was mentioned here.

I am using one of the workarounds from here. At the very bottom: "Customizing Language Recognition"

The workaround is to correctly update your config.cson under Atom > Config with:

"*":
  core:
    customFileTypes:
      "source.cpp": [
        "h"
      ]

[thomasjo]

Duplicate of #89. Can also be resolved using the customFileTypes feature, as described by @oulrich1