Where to use empty character constant ” in C++? [closed]

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Can we put it in C++ source code?

No, it would be a syntax error.

If not, what’s the usage of ”?

There is no usage, unless your purpose is to cause a compilation error (for which there are probably better alternatives such as static_assert).

Can it be understood that empty character constant ” is just a pure grammar error just like a variable being named as 2018ch ?

Yes. The grammar says:

character-literal:
     encoding-prefix opt ' c-char-sequence '

Notice that unlike the encoding-prefix, c-char-sequence is not optional.

Side note: Yes, it is a character sequence – multi character literals exist. But you don’t need to learn about them yet other than knowing that you probably won’t need them. Just don’t assume that they’re strings.

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