C ++ modifies the explicit keyword of the constrstructor.

The C ++ explicit keyword is mainly used to modify the class constructor, indicating that the constructor is explicit and the implicit conversion of a single parameter constructor is prohibited.

If the constructor of the C ++ class has a parameter, a default conversion operation will be performed during compilation: Convert the data of the corresponding data type of the constructor to this type of object, as shown below:

Class myclass

{

Public:

Myclass (INT num );

}

Myclass OBJ = 10; // OK, convert int to myclass

The aboveCodeThe compiler automatically converts an integer to a myclass object, which is actually equivalent to the following operation:

Myclass temp (10 );

Myclass OBJ = temp;

All the above operations are called "implicit conversions ".

To avoid this automatic conversion function, you can add the explicit keyword before declaring the constructor and declare the constructor of the class as "display ", this will prevent this automatic conversion operation.

Modify the constructor of the above myclass class as shown in. The following Code cannot be compiled as follows:

Class myclass

{

Public:

Explicit myclass (INT num );

}