Avoid Wzero-as-null-pointer-constant warning
#75
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Newer compilers may warn when using `0`, e.g.:
```
./boost/iterator/detail/facade_iterator_category.hpp:161:5: error: zero as null pointer constant [-Werror,-Wzero-as-null-pointer-constant]
BOOST_MPL_ASSERT_NOT((is_iterator_category<Traversal>));
^
./boost/mpl/assert.hpp:324:58: note: expanded from macro 'BOOST_MPL_ASSERT_NOT'
boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \
```
Flamefire
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May 6, 2023
The MPL version is slower to compile and `BOOST_STATIC_ASSERT` is already used in some places. So unify that. This also fixes `Wzero-as-null-pointer-constant` warnings, see boostorg/mpl#75
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Appveyor build failure seems to be a transient github error |
Lastique
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to boostorg/iterator
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May 7, 2023
The MPL version is slower to compile and `BOOST_STATIC_ASSERT` is already used in some places. So unify that. This also fixes `Wzero-as-null-pointer-constant` warnings, see boostorg/mpl#75
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Newer compilers may warn when using
0, e.g.: