Quote: template concepts restrict the allowable types; e.g., Assignable with Assignable as true

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Consider 'fill' from the Standard Library … A call 'fill(p, q, v)' will assign v … [p,q). ... Here is our current best bet for a convenient and compatible syntax [for concepts]: 'template where Assignable void fill(Iter first, … example, the boolean-valued expression 'Assignable' is true as … cannot assign a 'string' value' to a 'double' …   Google-1   Google-2

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