Edward Diener さんは書きました: > I could not find any explanation for the keyword 'invariant' in the PDF > doc. Is it the equivalent of the C++ 'const' in at least some of the > latter's usages ? > > The only explanation for it existed as part of Contract Programming, but > it seems to be used otherwise also. http://www.digitalmars.com/d/2.0/const3.html