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If a string is defined like this
std::string name; What will be the value of the uninitialized string "name" and what size it would be?
422
Because it is not initialized, it is the default constructor that is called. Then : empty string constructor (default constructor) : Constructs an empty string, with a length of zero characters.
Strings. Variables of type "String" are treated as Objects in this case and have a default value of null.
A std::string isn't a pointer, so it shouldn't be combined. PS. the initializations are the same: the ctor of std::string sets it to the empty string.
The std::string class manages the underlying storage for you, storing your strings in a contiguous manner. You can get access to this underlying buffer using the c_str() member function, which will return a pointer to null-terminated char array. This allows std::string to interoperate with C-string APIs.
Because it is not initialized, it is the default constructor that is called. Then :
empty string constructor (default constructor) :
Constructs an empty string, with a length of zero characters.
Take a look : http://www.cplusplus.com/reference/string/string/string/
EDIT : As stated in C++11, §21.4.2/1 :
Effects: Constructs an object of class basic_string. The postconditions of this function are indicated in Table 63.
-> Table 63 +-----------------------------------------------------------------------------+ | data() | a non-null pointer that is copyable and can have 0 added to it | +------------+----------------------------------------------------------------+ | size() | 0 | +------------+----------------------------------------------------------------+ | capacity() | an unspecified value | +-----------------------------------------------------------------------------+ If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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