In order to accomplish this, the arguments have to be stored in the
object. Because () evaluation order is not defined in the spec.
Because arguments have to be stored now, char pointers no longer work
and std::strings are stored instead. Systems object also cant be
returned as a reference anymore because you need to be able to know
which is the lhs and which is the rhs in the operator overloads.
Unlike std::basic_string::data() and string literals, data() may return
a pointer to a buffer that is not null-terminated. Therefore it is
typically a mistake to pass data() to a routine that takes just a const
CharT* and expects a null-terminated string.
The bug was calling string_view .data() after calling substr() that ends
before the null terminator, as it will just return the entire
string_view.
When an object of a class is created, the constructors of all member
variables are called consecutively in the order the variables are
declared, even if you don't explicitly write them to the initialization
list.
Riyyi