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Function std.exception.errnoEnforce

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

Prototype

T errnoEnforce(T, string file, ulong line)(
  T value,
  string msg = null
);

Parameters

NameDescription
value The value to test.
msg The message to include in the ErrnoException if it is thrown.

Returns

value if !value is false. Otherwise, new ErrnoException(msg) is thrown. ErrnoException assumes that the last operation set errno to an error code.

Example

auto f = errnoEnforce(fopen("data.txt"));
auto line = readln(f);
enforce(line.length); // expect a non-empty line

Authors

Andrei Alexandrescu and Jonathan M Davis

License

Boost License 1.0

Comments