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C++17 Quick Syntax Reference: A Pocket Guide to the Language, APIs and Library
book

C++17 Quick Syntax Reference: A Pocket Guide to the Language, APIs and Library

by Mikael Olsson
March 2018
Intermediate to advanced
183 pages
2h 34m
English
Apress
Content preview from C++17 Quick Syntax Reference: A Pocket Guide to the Language, APIs and Library
© Mikael Olsson 2018
Mikael OlssonC++17 Quick Syntax Referencehttps://doi.org/10.1007/978-1-4842-3600-0_21

21. Custom Conversions

Mikael Olsson1 
(1)
Hammarland, Finland
 

Custom type conversions can be defined to allow an object to be constructed from or converted to another type. In the following example, there is a class called MyNum with a single integer field. With conversion constructors, it is possible to allow integer types to be implicitly converted to this object’s type.

class MyNum
{
 public:
  int value;
};

Implicit Conversion Constructor

For this type of conversion to work, a constructor needs to be added that takes a single parameter of the desired type , in this case an int.

class MyNum
{
 public:
  int value;
  MyNum(int i) { value = i; }
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