Capture.cpp

struct S2 { void f(int i); };
void S2::f(int i)
{
    [&]{};          // OK: by-reference capture default
    [&, i]{};       // OK: by-reference capture, except i is captured by copy
    [&, &i] {};     // Warning: by-reference capture when by-reference is the default
    [&, this] {};   // OK, equivalent to [&]
    [&, this, i]{}; // OK, equivalent to [&, i]

    [=]{};          // OK: by-copy capture default
    [=, &i]{};      // OK: by-copy capture, except i is captured by reference
//  [=, *this]{};   // until C++17: Error: invalid syntax
                    // since C++17: OK: captures the enclosing S2 by copy
    [=, this] {};   // until C++20:
    // Until C++20: Warning: explicit by-copy capture of ‘this’ redundant with by-copy capture default
    // Since C++20: OK, same as [=]
}


int main(){return 0;}