[basic.def.odr] Make a lambda contract predicate odr-usable for captures#12
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[basic.def.odr] Make a lambda contract predicate odr-usable for captures#12abhinavagarwal07 wants to merge 1 commit into
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The odr-usability rule's lambda bullet (bullet 4) required the lambda's
block scope to be an intervening scope, but a function contract predicate
(e.g. [i] pre(i > 0) {}) lives in the lambda-declarator, in a
contract-assertion scope outside the block scope. This made the
normative [expr.prim.lambda] example "auto f3 = [i] pre(i > 0) {}; // OK"
ill-formed. Allow the second conjunct to be satisfied by a
contract-assertion scope introduced by a function contract assertion of
the lambda-expression, in addition to its block scope, while preserving
the CWG 2380 default-argument case as ill-formed.
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The odr-usability rule's lambda bullet (the fourth inner bullet of [basic.def.odr] p10) requires the lambda's block scope to be an intervening scope. But a function contract predicate (e.g.
[i] pre(i > 0) {}) lives in the lambda-declarator, in a contract-assertion scope that is outside the block scope, so a literal reading makes the normative [expr.prim.lambda] exampleauto f3 = [i] pre(i > 0) {}; // OKill-formed. Allow the second conjunct to be satisfied by a contract-assertion scope introduced by a function contract assertion of the lambda-expression, in addition to its block scope. The CWG 2380 default-argument case ([=](int k = n) {}) remains ill-formed.