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json/docs/mkdocs/docs/api/macros/json_no_io.md
Niels Lohmann 6a7392058e Complete documentation for 3.11.0 (#3464)
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Co-authored-by: Chaoqi Zhang <prncoprs@163.com>
Co-authored-by: Qianqian Fang <fangqq@gmail.com>
2022-05-17 13:08:56 +02:00

739 B

JSON_NO_IO

#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)).

Default definition

By default, #!cpp JSON_NO_IO is not defined.

#undef JSON_NO_IO

Examples

??? 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>

...
```

Version history

  • Added in version 3.10.0.