clang-10 warning: comparison of integers of different signs: 'typename iterator_traits<__wrap_iter<char *> >::difference_type' (aka 'long') and 'const std::size_t' (aka 'const unsigned long')
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Description
Hi!
In file boost/process/environment.hpp:
```
boost/process/environment.hpp:267:56: error: comparison of integers of different signs: 'typename iterator_traits<__wrap_iter >::difference_type' (aka 'long') and 'const std::size_t' (aka 'const unsigned long') [-Werror,-Wsign-compare]
if ((std::distance(st1.begin(), st1.end()) < len)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~
[...]
1 error generated.
```
Linked issue: https://github.com/boostorg/process/issues/267
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