What to do if constructor is not able to create object?
One way is to use some intermediate class that captures all parameters to the constructor. Another is to use the builder pattern. A constructor is expected to create an object that can be used from the word go. If for some reason it is not able to create a usable object, it should throw an exception and be done with it.
What happens if you throw an exception from the constructor?
If you throw an exception from the constructor to its outside world, the object will not be created. This means, the destructor will not be called and the memory will be freed immediately. A constructor must be called. You can not force the user to use any other function (except the destructor), only by convention.
Can a private constructor be used in a public builder?
This builder method implies Private constructor and Public (or friend) Builder. Note that having a Private constructor imposes a number of restrictions on the usages that can be done of a class (cannot be stored in STL containers, for example) so you might need to merge in other patterns.
Can a complex logic and a constructor mix well?
Complex logic and constructor do not always mix well, and there are strong proponents against doing heavy work in a constructor (with reasons). The cardinal rule is that the constructor should yield a fully usable object.
When do fields have to be fully assigned in Stack Overflow?
– Stack Overflow Struct constructor: “fields must be fully assigned before control is returned to the caller.” Field ‘AttackTraits.probability’ must be fully assigned before control is returned to the caller
How to assign a field to a struct constructor?
We cannot do it manually on our constructor because we don’t have access to the backing field of an automatic property. ValueType is the base class of all structs. try to access probability field not accessor. In this case auto-props should work as well.