Avoid -Wzero-as-null-pointer-constant warning in string_view ctor
#183
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This is an issue for C++11 and up for e.g. Boost libs that want to ensure warning-free build.
Solution is simply to move the SFINAE expression to the template argument list to avoid the
<..>* = 0default argumentAlternative:
enable_if<..., int>::type = 0