Function self_assignment

test/te.cpp:344–355

template<typename Stringy>
void self_assignment()
{
  std::string str{"hello world"};
  Stringy str1{str};

  expect(std::strcmp(str1.c_str(), str.c_str()) == 0); //this line is not really necessary, but why not, may as well test.
  Stringy& str2 = str1;
  str1 = str2; //self copy assignment
  expect(std::strcmp(str1.c_str(), str.c_str()) == 0); //we're testing that nothing has been deleted or messed up
  str2 = std::move(str1); //self move assignment
  expect(std::strcmp(str2.c_str(), str.c_str()) == 0); //we're testing that nothing has been deleted or messed up
}

test test_self_assignment = [] {
  self_assignment<te::poly<IStringy, te::non_owning_storage>>();