Including an Inline File

Problem

You have a number of membe r functions or standalone functions that you want to make inline, but you don't want to define them all in the class definition (or even after it) in the header file. This way, you keep declaration and implementation separate.

Solution

Create an .inl file and #include it at the end of your header file. This is equivalent to putting the function definition at the end of the header file, but this lets you keep declaration and definition separate. Example 2-6 shows how.

Example 2-6. Using an inline file

// Value.h
#ifndef VALUE_H_ _
#define VALUE_H_ _

#include 

class Value {
public:
 Value (const std::string& val) : val_(val) {}
 std::string getVal( ) const;
private:
 std::string val_;
};

#include "Value.inl"

#endif VALUE_H_ _

// Value.inl
inline std::string Value::getVal( ) const {
 return(val_);
}

This solution doesn't require much explanation. #include is replaced with the contents of its argument, so what happens here is that the contents of Value.inl are brought into the header file. Any file that includes this header, therefore, has the definition of the inline functions, but you don't have to clutter up your class declaration.

Building C++ Applications

Code Organization

Numbers

Strings and Text

Dates and Times

Managing Data with Containers

Algorithms

Classes

Exceptions and Safety

Streams and Files

Science and Mathematics

Multithreading

Internationalization

XML

Miscellaneous

Index

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C++ Cookbook
Secure Programming Cookbook for C and C++: Recipes for Cryptography, Authentication, Input Validation & More
ISBN: 0596003943
EAN: 2147483647
Year: 2006
Pages: 241
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