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Alias `std.exception.errnoEnforce`

Enforces that the given value is true, throwing an ErrnoException if it is not.


						
				alias errnoEnforce
				 = enforce!ErrnoException;

Parameters

Name	Description
value	The value to test.
msg	The message to include in the `ErrnoException` if it is thrown.

Returns

value, if cast(bool) value is true. Otherwise, new ErrnoException(msg) is thrown. It is assumed that the last operation set errno to an error code corresponding with the failed condition.

Example

import core.stdc.stdio : fclose, fgets, fopen;
import std.file : thisExePath;
import std.string : toStringz;

auto f = fopen(thisExePath.toStringz, "r").errnoEnforce;
scope(exit) fclose(f);
char[100] buf;
auto line = fgets(buf.ptr, buf.length, f);
enforce(line !is null); // expect a non-empty line

Authors

Andrei Alexandrescu and Jonathan M Davis

License

Boost License 1.0