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Monday, June 9, 2008

C++ Explicit

 June 09, 2008     CPP     No comments   

What is explicit keyword?

  • A constructor that takes a single argument operates as an implicit conversion operator by default. This is also referred as converting constructor.
  • To prevent this implicit conversion keyword explicit has been introduced in C++. This makes the constructor as non-converting.
  • This keyword has effect only when defined on a single argument constructor or on a constructor which has default arguments for all but one argument.
  • Compile time error will be reported if an attempt is made to create an object via conversion as in statements like "MyClass obj2 = 200;".

Demonstrate the usage of explicit keyword

#include <iostream>
using namespace std;

class MyClass {
int data;
public:
explicit MyClass(int aData) {
cout << "Constructor invoked" << endl;
data = aData;
}
};

int main ()
{

MyClass obj1(100);

/*
* Object creation by conversion as below reports a compiler error.
* Error E2034 explicit.cpp 15: Cannot convert 'int' to 'MyClass'
* in function main()
*/
// MyClass obj2 = 200;
}
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