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C++

explicit

The explicit keyword is an optional decoration for constructors that take exactly one argument. It only applies to single-argument constructors since those are the only constructors that can be used in type casting.

Syntax:

explicit functionname(dataype)

Example:

class A {
        public:
                explicit A(int);
        };

        void f(A) {}

        void g()
        {
                A a1 = A(37);

                A a2 = A(47);

                A a3(57);

                a1 = A(67);

                f(A(77));
        }

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