#define errno /* implementation-defined */
errno is a preprocessor macro used for error indication. It expands to a static(until C++11)thread-local(since C++11) modifiable lvalue of type int.
Several standard library functions indicate errors by writing positive integers to errno. Typically, the value of errno is set to one of the error codes, listed in <cerrno> as macro constants that begin with the letter E, followed by uppercase letters or digits.
The value of errno is â0â at program startup, and although library functions are allowed to write positive integers to errno whether or not an error occurred, library functions never store â0â in errno.
[edit] ExamplePossible output:
nan log(-1) failed: Numerical argument out of domain Or, in German, Das numerische Argument ist ausserhalb des Definitionsbereiches[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR Applied to Behavior as published Correct behavior LWG 310 C++98 it was unclear whether errno is a macroRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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