https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78030
Bug ID: 78030
Summary: Lambda capture expression (different results than
Clang & MSVC)
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sthlm58 at gmail dot com
Target Milestone: ---
The following code is supposed to remove non-unique elements from the vector
(i.e. already existing in a set 's' (which is captured by value for the lambda
purposes))
Problem is: it produces different results than Clang and MSVC, which seem to be
correct.
#include <algorithm>
#include <iostream>
#include <set>
#include <vector>
template <typename T>
void print(T c) { for (auto e : c) std::cout << e << " "; std::cout <<
std::endl; }
int main()
{
std::vector<int> elements { 1, 2, 4, 2, 1, 4, 5, 4, 4, 5, 1, 3, 0 };
elements.erase(std::remove_if(elements.begin(), elements.end(), [s =
std::set<int>()](intc) mutable
{
return !s.insert(c).second;
}), elements.end());
print(elements);
}
OUTPUT:
1 2 4 1 4 5 3 0 // GCC 4.x / 5.x / 6.x / 7.0
REQUIRED OUTPUT:
1 2 4 5 3 0 // Clang 3.4 - 4.0, Lastest MSVC
Shown here:
http://melpon.org/wandbox/permlink/h68S9ZKLYZqw4kvP
