Use explicitly deleted functions to make types non-copyable #111
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Note
(FMT_GCC_VERSION >= 404 && __cplusplus >= 201103L)
means(FMT_GCC_VERSION >= 407 && __cplusplus >= 201103L)
actually because of the gcc bug. CMake checks are suggested.I'll create another PR after this gets merged. As for nullptr, I think it's acceptable as a monkey patch. Such things have been done by libc++.