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Enum member std.digest.isDigest

Use this to check if a type is a digest. See ExampleDigest to see what a type must provide to pass this check.

enum isDigest(T) = isOutputRange!(T, const(ubyte)[]) && isOutputRange!(T, ubyte) && is(T == struct) && is(typeof(() { T dig = void; dig.put(cast(ubyte)0, cast(ubyte)0); dig.start(); auto value = dig.finish(); } ));


This is very useful as a template constraint (see examples)


  • Does not yet verify that put takes scope parameters.
  • Should check that finish() returns a ubyte[num] array


import std.digest.crc;
static assert(isDigest!CRC32);


import std.digest.crc;
void myFunction(T)()
if (isDigest!T)
    T dig;
    auto result = dig.finish();


Johannes Pfau


Boost License 1.0.