The macro ARDUINOJSON_ENABLE_STD_STREAM controls the support of std::istream and std::ostream in the library.
On C++17-capable compilers, ArduinoJson can detect the presence of specific header files. In that case, the default value of ARDUINOJSON_ENABLE_STD_STREAM is:
On older compilers, ArduinoJson tries to guess whether std::istream/std::ostream are available or not, based on the presence of the ARDUINO macro. In that case, the default value of ARDUINOJSON_ENABLE_STD_STREAM is:
0 if ARDUINO is defined,1 otherwise.In other words, ArduinoJson assumes that std::istream/std::ostream are available as soon as you work outside of Arduino.
If you need to force the support of std::istream/std::ostream, add the following line at the top of your program:
#define ARDUINOJSON_ENABLE_STD_STREAM 1
#include <ArduinoJson.h>
If for some reason, you need to disable the support for std::istream/std::ostream, add the following line at the top of your program:
#define ARDUINOJSON_ENABLE_STD_STREAM 0
#include <ArduinoJson.h>
Only 0 and 1 are valid. Any other value (like false or true) will produce a compilation error.
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