rtrieu added a comment.
This seems to be acting weird in template instantations. Here's an example
where the lambda only errors inside a template.
template <class>
int foo(int x = 0) {
auto lambda = [x = x+1]() -> decltype(x) {
return x;
};
return -1;
}
// no template
int bar(int x = 0) {
auto lambda = [x = x+1]() -> decltype(x) {
return x;
};
return -1;
}
int a = foo<int>(); // error
int b = bar(); // no error
/tmp/lambda.cc:4:16: error: variable 'x' cannot be implicitly captured in a
lambda with no capture-default specified
return x;
^
/tmp/lambda.cc:17:9: note: in instantiation of function template
specialization 'foo<int>' requested here
int a = foo<int>(); // error
^
/tmp/lambda.cc:3:20: note: 'x' declared here
auto lambda = [x = x+1]() -> decltype(x) {
^
/tmp/lambda.cc:3:19: note: lambda expression begins here
auto lambda = [x = x+1]() -> decltype(x) {
^
/tmp/lambda.cc:3:27: note: capture 'x' by value
auto lambda = [x = x+1]() -> decltype(x) {
^
, x
/tmp/lambda.cc:3:27: note: capture 'x' by reference
auto lambda = [x = x+1]() -> decltype(x) {
^
, &x
/tmp/lambda.cc:3:20: note: default capture by value
auto lambda = [x = x+1]() -> decltype(x) {
^
=,
/tmp/lambda.cc:3:20: note: default capture by reference
auto lambda = [x = x+1]() -> decltype(x) {
^
&,
1 error generated.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D119136/new/
https://reviews.llvm.org/D119136
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