This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 117b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2025-08-11
1538. C-style cast in braced-init-list assignmentSection: 7.6.19 [expr.assign] Status: CD3 Submitter: Daniel Krügler Date: 2012-08-14[Moved to DR at the April, 2013 meeting.]
According to 7.6.19 [expr.assign] paragraph 9,
The meaning of x={v}, where T is the scalar type of the expression x, is that of x=T(v) except that no narrowing conversion (9.5.5 [dcl.init.list]) is allowed. The meaning of x={} is x=T().
This definition adds a gratuitous C-style cast to the right-hand operand, inadvertently allowing such things as base-to-derived conversions and circumvention of access checking.
Proposed resolution (October, 2012):
Change 7.6.19 [expr.assign] paragraph 9 as follows:
The meaning of x={v}, where T is the scalar type of the expression x, is that of x=T(v) except that no narrowing conversion (9.5.5 [dcl.init.list]) is allowed x=T{v}. The meaning of x={} is x=T() x=T{}.
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