学习日志—const reference

A nonconst reference may be attached only to an object of the same type as the reference itself.

 

A const reference may be bound to an object of a different but related type or to an rvalues（10）.

 

For example:

 

double dval = 3.14;const int &ri = dval;//the complier transforms this code into something like this.int temp = dval; //create temporary int from the doubleconst int &ri = temp; //bind ri to that temporary