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| Paavo Helde <myfirstname@osa.pri.ee>: Jul 25 09:12PM +0300 > from main.cpp:1: > Sub.h:4:7: error: previous definition of 'class Sub' > class Sub : public Base { You need to protect your header files against multiple inclusion. Nowadays in practice it is just OK to put in the start of each header file: #pragma once |
| "Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com>: Jul 25 09:56PM +0200 On 25.07.2016 21:14, Jerry Stuckle wrote: > Just beware that not all compilers support #pragma once. There is a list in Wikipedia. In practice, a compiler that doesn't support `#pragma once` is one that quite likely also has many other quirks, i.e. not a good idea to use it. > 
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