MSVC 2015 treats two function templates that differ only in a decltype
return type as a redefinition (C2995), which breaks all three Visual
Studio 2015 jobs on AppVeyor. Overload on the view's mode in the
parameter type instead; template argument deduction ignores the
read-only-to-editable conversion, so each view still selects the
overload of its own mode.
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
Niels Lohmann
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