1# JSON_NO_IO 2 3```cpp 4#define JSON_NO_IO 5``` 6 7When defined, headers `<cstdio>`, `<ios>`, `<iosfwd>`, `<istream>`, and `<ostream>` are not included and parse functions 8relying on these headers are excluded. This is relevant for environments where these I/O functions are disallowed for 9security reasons (e.g., Intel Software Guard Extensions (SGX)). 10 11## Default definition 12 13By default, `#!cpp JSON_NO_IO` is not defined. 14 15```cpp 16#undef JSON_NO_IO 17``` 18 19## Examples 20 21??? example 22 23 The code below forces the library not to use the headers `<cstdio>`, `<ios>`, `<iosfwd>`, `<istream>`, and 24 `<ostream>`. 25 26 ```cpp 27 #define JSON_NO_IO 1 28 #include <nlohmann/json.hpp> 29 30 ... 31 ``` 32 33## Version history 34 35- Added in version 3.10.0. 36