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Which value does the default constructor of the bool type return in C++?
For instance, writing
int i = int(); guarantees that the variable i will be initiated always with 0.
I guess such an initialization routine is possible as well:
bool b = bool(); But unfortunately I could not find anywhere which value such a default bool constructor is defined to return. Is the variable b always initialized with false or true.
493
The default value of the bool type is false .
The default constructor in Java initializes the data members of the class to their default values such as 0 for int, 0.0 for double etc. This constructor is implemented by default by the Java compiler if there is no explicit constructor implemented by the user for the class.
The default value of boolean data type in Java is false, whereas in C++, it has no default value and contains garbage value (only in case of global variables, it will have default value as false).
Boolean values and operations They are used as the values of expressions that have yes-or-no answers. C++ is different from Java in that type bool is actually equivalent to type int. Constant true is 1 and constant false is 0.
false.
Seen in the C++14 draft N4296, section 8.5 (Initializers), paragraph 6, list item 1 and references therein, and paragraph 8, list item 4.
139
bool is an integral type, and value-intialization should make it zero.
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