Fix harmless MSVS warning about using undefined _MANAGED symbol #2183
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Since the changes of 1305cbe (Fix MSVC2019 error C2049 when compiling with /clr (fmtlib#1897), 2020-09-23), compiling fmt with MSVS 2019 resulted in fmt\include\fmt\core.h(180,32): warning C4668: '_MANAGED' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif'. when the (disabled by default) warning C4668 was enabled. Fix this simply by checking if _MANAGED is defined before testing it.
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sthagen
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Mar 17, 2021
Fix harmless MSVS warning about using undefined _MANAGED symbol (fmtlib#2183)
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Since the changes of 1305cbe (Fix MSVC2019 error C2049 when compiling
with /clr (#1897), 2020-09-23), compiling fmt with MSVS 2019 resulted in
fmt\include\fmt\core.h(180,32): warning C4668: '_MANAGED' is not defined
as a preprocessor macro, replacing with '0' for '#if/#elif'.
when the (disabled by default) warning C4668 was enabled.
Fix this simply by checking if _MANAGED is defined before testing it.
I agree that my contributions are licensed under the {fmt} license, and agree to future changes to the licensing.