Class Foo

test/flat_map_unittest.cpp:47–51

int g_foo_copy_ctor = 0;
int g_foo_assign = 0;
struct Foo {
    Foo() { ++g_foo_ctor; }
    Foo(const Foo&) { ++g_foo_copy_ctor; }
    void operator=(const Foo&) { ++g_foo_assign; }
};
struct Bar {
    int x;
};