The keyword this names a pointer to the object for which a non-static member function is invoked or a non-static data member's initializer ([class.mem]) is evaluated.
If a declaration declares a member function or member function template of a class X, the expression this is a prvalue of type “pointer to cv-qualifier-seq X” between the optional cv-qualifier-seq and the end of the function-definition, member-declarator, or declarator. It shall not appear before the optional cv-qualifier-seq and it shall not appear within the declaration of a static member function (although its type and value category are defined within a static member function as they are within a non-static member function). [ Note: This is because declaration matching does not occur until the complete declarator is known. — end note ] Unlike the object expression in other contexts, *this is not required to be of complete type for purposes of class member access outside the member function body. [ Note: Only class members declared prior to the declaration are visible. — end note ] [ Example:
struct A {
char g();
template<class T> auto f(T t) -> decltype(t + g())
{ return t + g(); }
};
template auto A::f(int t) -> decltype(t + g());
— end example ]
The expression this shall not appear in any other context. [ Example:
class Outer {
int a[sizeof(*this)]; unsigned int sz = sizeof(*this);
void f() {
int b[sizeof(*this)];
struct Inner {
int c[sizeof(*this)]; };
}
};
— end example ]
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