https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115052
Bug ID: 115052
Summary: rejected lambda while capturing a constexpr array
Product: gcc
Version: 14.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: franckbehaghel_gcc at protonmail dot com
Target Milestone: ---
The following code is fine :
constexpr int a1[] = { 1, 2};
int f_lambda_capturing_case1(int id)
{
return [] (int i) { return a1[i];}(id);
}
But this one is rejected :
int f_lambda_capturing_case2(int id)
{
constexpr int a2[] = { 1, 2};
return [] (int i) { return a2[i];}(id);
}
In lambda function:
<source>:12:31: error: 'a2' is not captured
12 | return [] (int i) { return a2[i];}(id);
| ^~
<source>:12:12: note: the lambda has no capture-default
12 | return [] (int i) { return a2[i];}(id);
| ^
<source>:11:18: note: 'constexpr const int a2 [2]' declared here
11 | constexpr int a2[] = { 1, 2};
The second case seems also valid as it is just a change of scope.
Moreover it is accepted by clang.
regards,
