C++ — Why should we use explicit in this constructor?

Question

Please refer to Wikipedia:Strategy Pattern (C++)

class Context
{
    private:
        StrategyInterface * strategy_;

    public:
        explicit Context(Strate         


        

Answer 1

Because it's generally a good idea to use explicit unless you really want to allow implicit conversion. Since you're unlikely to use a Context object in a situation where you really gain anything from an implicit conversion, you're better off making it explicit.