http://llvm.org/bugs/show_bug.cgi?id=19231
Bug ID: 19231
Summary: Returning lambdas with dangling references produces no
warning
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
In C++14 you can return lambdas from functions directly as well as stored in an
std::function. In both cases, the compiler never warns about dangling
references even in trivial situations (same is true when returning any other
function object with a dangling reference).
This mistake is easy to make and hard to debug. It would be nice if it could be
prevented by Wall.
Example:
#include <iostream>
auto f(const int a) {
const int b = a;
return [&](){ return b; }; // returns dangling ref inside the lambda
}
int main() {
auto i = f(0);
std::cout << "i: " << i() << "\n";
return 0;
}
flags used: -O0 -std=c++1y -Wall -Wextra
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