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move is_valid() logic to constructor or factory function? #4

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dckc opened this issue Nov 3, 2016 · 0 comments
Open

move is_valid() logic to constructor or factory function? #4

dckc opened this issue Nov 3, 2016 · 0 comments

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@dckc
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dckc commented Nov 3, 2016

Why have methods such as CryptoSecretBoxNonce.is_valid()? Why not forbid creation of an invalid CryptoSecretBoxNonce by using a private constructor and a factory function that can fail?

This is perhaps mostly a question of what idomatic pony should look like.
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