8000 C2766 explicit specialization; 'specialization' has already been defined when compiling on Visual Studio with /Zc:__cplusplus flag · Issue #1250 · bblanchon/ArduinoJson · GitHub
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C2766 explicit specialization; 'specialization' has already been defined when compiling on Visual Studio with /Zc:__cplusplus flag #1250
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C2766 explicit specialization; 'specialization' has already been defined when compiling on Visual Studio with /Zc:__cplusplus flag#1250
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archieLa
opened on Apr 27, 2020

Since Visual Studio 2017 when /Zc:__cplusplus flag is used then the __cplusplus macro is evaluated correctly based on C++ standard used. When that happens the C2766 occurs since both ARDUINOJSON_HAS_LONG_LONG and ARUDINO_HAS_INT_64 are evaluated to be true and cause duplicate template specialization

ArduinoJson/src/ArduinoJson/Configuration.hpp

Line 8 in daa279d

561C
#define ARDUINOJSON_HAS_INT64 1

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