This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 113d. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2024-04-05
In the current specification of lambda expressions, a name appearing in a lambda-capture must refer to a local variable or reference with automatic storage duration (7.5.5 [expr.prim.lambda] paragraph 3). This restriction seems unnecessary and possibly confusing.
One possibility would be to extend the syntax of the lambda-capture to be something like
v = expr
with the meaning that the closure object would have a member named v initialized with the value expr. With this extension, the current syntax could be viewed as an abbreviation for
v = v
Rationale, March, 2009:
This idea was discussed and rejected by the EWG.
This issue was addressed by the adoption of N3648, adopted at the April, 2013 (Bristol) meeting.