#define JSON_NO_IO
When defined, headers <cstdio>, <ios>, <iosfwd>, <istream>, and <ostream> are not included and parse functions relying on these headers are excluded. This is relevant for environments where these I/O functions are disallowed for security reasons (e.g., Intel Software Guard Extensions (SGX)).
By default, #!cpp JSON_NO_IO is not defined.
#undef JSON_NO_IO
??? example
The code below forces the library not to use the headers `<cstdio>`, `<ios>`, `<iosfwd>`, `<istream>`, and `<ostream>`. ```cpp #define JSON_NO_IO 1 #include <nlohmann/json.hpp> ... ```