http://llvm.org/bugs/show_bug.cgi?id=21664
Bug ID: 21664
Summary: Crash while capture template std::function in lambdas
Product: clang
Version: 3.4
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
When trying to capture a template std::function alias in a lambda by value, I
am experiencing a crash in the resulting binary. Here is a code snippet showing
this error:
#include <functional>
template<class T>
using Callback = std::function<void (T)>;
std::function<void ()> f(const Callback<int> &callback)
{
return [=] {
callback(0); // crash here
};
}
int main()
{
auto lambda = f([](int) { });
lambda();
return 0;
}
This also happens when explicitly capturing "callback". To work around the
crash, the variable needs to be captured using generalized capture:
#include <functional>
template<class T>
using Callback = std::function<void (T)>;
std::function<void ()> f(const Callback<int> &callback)
{
return [=, callback = callback] {
callback(0); // no crash now
};
}
int main()
{
auto lambda = f([](int) { });
lambda();
return 0;
}
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