Default capacity of std::string?

c++ string std dynamic-memory-allocation stdstring
void.pointer picture void.pointer · Jan 31, 2012 · Viewed 9.4k times · Source

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

pmr picture pmr · Jan 31, 2012

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.

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