By default, the no-argumentД¬onstructors are invoked. Parent class and then for its fields are invoked. now, the exception is rethrown as if we'd writtenД«efore the body of the constructor is run, all of the constructors for its The syntax for catching an exception in an initialization list is somewhat awkward: the 'try' goes right before the colon, and the catch goes after the body of the function: That there's some kind of translation of error messages that needs to be done. That said, one reason you'd want to catch an exception here is

Rethrown because it cannot be guaranteed that your object is in a valid stateД«ecause one of its fields (or parts of its parent class) couldn't be

Since constructors can throw exceptions, it's possible that you might want toД«e able to handle exceptions that are thrown by constructors invoked as part ofДЇirst, you should know that even if you catch the exception, it will get Initialization list since references are immutable they can be initialized If you have a field that is a reference, you also must initialize it in the With no default constructor), you must specify which constructor you wish to If you have a field that has no default constructor (or a parent class When Else do you Need Initialization Lists? No Default Constructor Must be initialized in the initialization list. If you have a const field, then it can be initialized only once, so it (although it is probably more convenient than other approaches). Using initialization lists to initialize fields is not always necessary works as long as T has a copy constructor

Ways of handling initializing fields of the templated type for the case of This behavior allows you to specify templates where the templated type can beД®ither a class or a primitive type (otherwise, you would have to have different Quux() : _my_int( 5 ) // sets _my_int to 5 When the field isДЄ primitive type, giving it an argument is equivalent to assignment. Types (objects of classes) and primitive types (e.g., int). It turns out that initialization lists work to initialize both user-defined That is, the compiler knows which foo belongs to the object, and which foo

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