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Update note on static const data members for C++17.

Using `constexpr` provides a tidier solution, where applicable.

PiperOrigin-RevId: 343276402
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Abseil Team 2020-11-19 09:13:24 -05:00 committed by Gennadiy Rozental
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googletest/docs/faq.md
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@ -217,6 +217,18 @@ particular, using it in googletest comparison assertions (`EXPECT_EQ`, etc) will
generate an "undefined reference" linker error. The fact that "it used to work"
doesn't mean it's valid. It just means that you were lucky. :-)
If the declaration of the static data member is `constexpr` then it is
implicitly an `inline` definition, and a separate definition in `foo.cc` is not
needed:
```c++
// foo.h
class Foo {
...
static constexpr int kBar = 100; // Defines kBar, no need to do it in foo.cc.
};
```
## Can I derive a test fixture from another?
Yes.