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PODistinct implementations for pure virtual functions with same name
primarykey
Id
7925792
data
AcceptedAnswerId
0
AnswerCount
4
ClosedDate
2011-10-31T02:58:34.110
CommentCount
3
CommunityOwnedDate
CreationDate
2011-10-28T06:17:45.837
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2011-11-02T07:32:46.570
LastEditDate
2017-05-23T12:19:57.947
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1017802
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6
ViewCount
2279
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text
Body
<blockquote> Possible Duplicate: <a href="https://stackoverflow.com/questions/2004820/inherit-interfaces-which-share-a-method-name">Inherit interfaces which share a method name</a> </blockquote> I have two base classes <code>I1</code> and <code>I2</code> with pure virtual functions <code>void R() = 0;</code>. I want the derived class <code>IImpl</code> to inherit from <code>I1</code> and <code>I2</code> and to have distinct implementations for <code>I1::R()</code> and <code>I2::R()</code>. The code below compiles and works in MS VS 2005 and 2010. I compile with Language Extension disabled and on warning level 4. There are no warnings and no errors. I tried the same code in gcc 4.2. It does not compile. GCC reports an error: <pre><code>error: cannot define member function 'I1::R' within 'IImpl' </code></pre> My questions are: <ol> <li>Why that code works in MS VS and why it does not work in gcc?</li> <li>Is the code a standard C++? </li> <li>What is the correct way to implement it, so it is a standard C++ and compiles on VS and gcc?</li> </ol> Thanks! <pre><code>#include <stdio.h> class I1 { public: virtual void R() = 0; virtual ~I1(){} }; class I2 { public: virtual void R() = 0; virtual ~I2(){} }; class IImpl: public I1, public I2 { public: virtual void I1::R() { printf("I1::R()\r\n"); } virtual void I2::R() { printf("I2::R()\r\n"); } }; int main(int argc, char* argv[]) { IImpl impl; I1 *p1 = &impl; I2 *p2 = &impl; p1->R(); p2->R(); return 0; } </code></pre>
Tags
<c++><visual-c++><gcc>
Title
Distinct implementations for pure virtual functions with same name
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