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Message: [QUOTE="James Kanze, post: 2990763"] Once constructed, yes. The difference is in the construction: a POD is an agglomerate (although not all agglomerates are POD's), and uses agglomerate initialization syntax, e.g.: Point z = { 1, 2 } ; Especially useful, of course, is the fact that a POD can be statically initialized (and so is exempt from order of initialization issues). A POD can also be a member of a union. The basic idea behind this, of course, is that if there is a user defined constructor (actually, if there is a non-trivial constructor), the compiler will call it, anytime there is an object of the type. Calling it means that initialization is no longer static, and having to call it means that the object cannot be a member of a union (since the compiler cannot know a priori which constructor to call). [/QUOTE]