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c++cheader-files
yan bellavance
yan bellavance

Reputation: 4830

Can't include dynamic library header file in more than one file?

I have successfully added a dynamic library to a program, but when I try to include the header file in a second file of the project I get errors about class redeclaration. I will add more info if this isn't enough

Upvotes: 0

Views: 619

Answers (2)

johannes
johannes

Reputation: 15969

An #include will replace the #include statement with the files content; having multiple #include's of the same file will therefore redefine the elements multiple times. The typical way is a safeguard like:

/* file foo .h */
#ifndef _FOO_H
#define _FOO_H

/* content */

#endif

Upvotes: 4

dj2
dj2

Reputation: 9620

You need to put guards into your header so it isn't included multiple times. For file 'my.h', you can add something along the lines of:

#ifndef MY_H
#define MY_H

// Header declarations here

#endif

This way, you can include the .h file multiple times but it will only be included the first time.

Upvotes: 5

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