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name Punditsdkoslkdosdkoskdo

C++ instantiate class comparison

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class Myclass { 
public: 
    int value;
    Myclass(int a):value(a) {} 
}; 

Say I have a class declared and defined above. I'm trying to instantiate a Myclass instance. Which of the following ways is the most efficient?
(By "More efficient" I mean the code will execute faster.)

Myclass c1(123);
Myclass c2=123;
Myclass c3{(123)};
Myclass c4{123}; // Is this called using "initialization list"?