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Enum member std.digest.hasPeek
Used to check if a digest supports the peek
method.
Peek has exactly the same function signatures as finish, but it doesn't reset
the digest's internal state.
enum hasPeek(T)
= isDigest!T && is(typeof(()
{
T dig = void;
DigestType!T val = dig .peek();
}
));
Note
- This is very useful as a template constraint (see examples)
- This also checks if T passes
isDigest
Example
import std .digest .crc, std .digest .md;
assert(!hasPeek!(MD5));
assert(hasPeek!CRC32);
Example
import std .digest .crc;
void myFunction(T)()
if (hasPeek!T)
{
T dig;
dig .start();
auto result = dig .peek();
}
myFunction!CRC32();
Authors
Johannes Pfau
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.