c++ - Default capacity of std::string?

Question

When I create a std::string using the default constructor, is ANY memory allocated on the heap? I'm hoping the answer does not depend on the implementation and is standardized. Consider the following:

std::string myString;

Answer 1

Unfortunately, the answer is no according to N3290.

Table 63 Page 643 says:

• data() a non-null pointer that is copyable and can have 0 added to it
• size() 0
• capacity() an unspecified value

The table is identical for C++03.