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### 507. Missing requirement for variate_generator::operator()

Section: 28.5 [rand], 99 [tr.rand.var] Status: CD1 Submitter: Walter Brown Opened: 2005-07-03 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

Paragraph 11 of [tr.rand.var] equires that the member template

>     template<class T> result_type operator() (T value);

return

>     distribution()(e, value)

However, not all distributions have an operator() with a corresponding signature.

[ Berlin: As a working group we voted in favor of N1932 which makes this moot: variate_generator has been eliminated. Then in full committee we voted to give this issue WP status (mistakenly). ]

Proposed resolution:

We therefore recommend that we insert the following precondition before paragraph 11:

> Precondition: `distribution().operator()(e,value)` is well-formed.