Commits on Dec 28, 2020

1. Fix compilation of input_adapter(container) in edge cases …

   This fixes a compilation issue with the library if trying to use containers that
   don't have non-member `begin()` and `end()` functions via ADL.
   
   This patch extends the `using std::begin` and `using std::end` declarations to
   also cover the return type deduction of the input_adapter() template
   specialization for containers. The previous implementation only enabled the
   detection of `std::begin()` and `std::end()` in the function body, making the
   specialization unusable for container types that only have member `begin()` and
   `end()` functions.
   
   It is not typical to have `using` declarations in the namespace scope in a
   header file. But a C++11 implementation can't rely on fully automatic return
   type deduction, and needs to rely on ADL enabled helper templates. To prevent
   the using declarations leaking, they are enclosed in another nested namespace.

   

   jasujm committed Dec 28, 2020
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