contract unsigned(v T) {
// Require T to be an integer type.
v % 1
// This is satisfied by any unsigned integer type, but not by a
signed integer type.
v = 1<<(unsafe.Sizeof(v) * 8 - 1)
}
That requires an import, not to mention unsafe, which raises the issue of
whether a contract must be written in pure Go without imports. I'm not
sure, but I do think it might be good that it does.
Even then, saying v%1 is the way to ask for an integer is infelicitous at
best.
To my mind this general area is the least clear part of the contracts
design: what _is_ a contract?
-rob
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