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add forward declaration examples

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add class & inheritance examples
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david
2025-03-19 12:31:23 +01:00
parent f10623163b
commit 4a753b0b8d
17 changed files with 665 additions and 1 deletions
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CPlusPlus/forward_declaration/forward_declaration.vcxproj
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CPlusPlus/forward_declaration/forward_declaration.vcxproj.filters
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CPlusPlus/forward_declaration/functions.cpp
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#include "functions.h"
void functionE() {} // definition
CPlusPlus/forward_declaration/functions.h
+9
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#pragma once
#ifndef _FUNCTIONS_H_
#define _FUNCTIONS_H_
void functionE(); // declaration
//void functionF() {} // defined & declared, linker error when included multiple times
#endif // _FUNCTIONS_H_
CPlusPlus/forward_declaration/main.cpp
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#include "functions.h"
void functionB() {} // declared & defined
void functionC(); // declare
void functionD(); // foward declare
int main()
{
//functionA(); // compiler error, because function is declared & defined after this call
functionB(); // no error
//functionC(); // linker error, because function is declared, but not defined
functionD();
functionE();
//functionF(); // linker error, because header file was included multiple times with a definition
return 0;
}
void functionA() {} // declare & defined
void functionD() {} // definition