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th: 2694 --- title: "Explicit Overrides (C++)" ms.date: "11/04/2016" helpviewer_keywords: ["virtual functions [C++], explicit overrides", "overriding, functions", "derived classes [C++], virtual functions", "explicit virtual function overrides", "explicit override of virtual function"] ms.assetid: ee583234-5cda-4e90-b55e-3f9fbf079ced --- # Explicit Overrides (C++) **Microsoft Specific** If the same virtual function is declared in two or more [interfaces](../cpp/interface.md) and if a class is derived from these interfaces, you can explicitly override each virtual function. For information on explicit overrides in managed code using C++/CLI, see [Explicit Overrides](../extensions/explicit-overrides-cpp-component-extensions.md). **END Microsoft Specific** ## Example The following code example illustrates how to use explicit overrides: ```cpp // deriv_ExplicitOverrides.cpp // compile with: /GR extern "C" int printf_s(const char *, ...); __interface IMyInt1 { void mf1(); void mf1(int); void mf2(); void mf2(int); }; __interface IMyInt2 { void mf1(); void mf1(int); void mf2(); void mf2(int); }; class CMyClass : public IMyInt1, public IMyInt2 { public: void IMyInt1::mf1() { printf_s("In CMyClass::IMyInt1::mf1()\n"); } void IMyInt1::mf1(int) { printf_s("In CMyClass::IMyInt1::mf1(int)\n"); } void IMyInt1::mf2(); void IMyInt1::mf2(int); void IMyInt2::mf1() { printf_s("In CMyClass::IMyInt2::mf1()\n"); } void IMyInt2::mf1(int) { printf_s("In CMyClass::IMyInt2::mf1(int)\n"); } void IMyInt2::mf2(); void IMyInt2::mf2(int); }; void CMyClass::IMyInt1::mf2() { printf_s("In CMyClass::IMyInt1::mf2()\n"); } void CMyClass::IMyInt1::mf2(int) { printf_s("In CMyClass::IMyInt1::mf2(int)\n"); } void CMyClass::IMyInt2::mf2() { printf_s("In CMyClass::IMyInt2::mf2()\n"); } void CMyClass::IMyInt2::mf2(int) { printf_s("In CMyClass::IMyInt2::mf2(int)\n"); } int main() { IMyInt1 *pIMyInt1 = new CMyClass(); IMyInt2 *pIMyInt2 = dynamic_cast(pIMyInt1); pIMyInt1->mf1(); pIMyInt1->mf1(1); pIMyInt1->mf2(); pIMyInt1->mf2(2); pIMyInt2->mf1(); pIMyInt2->mf1(3); pIMyInt2->mf2(); pIMyInt2->mf2(4); // Cast to a CMyClass pointer so that the destructor gets called CMyClass *p = dynamic_cast(pIMyInt1); delete p; } ``` ```Output In CMyClass::IMyInt1::mf1() In CMyClass::IMyInt1::mf1(int) In CMyClass::IMyInt1::mf2() In CMyClass::IMyInt1::mf2(int) In CMyClass::IMyInt2::mf1() In CMyClass::IMyInt2::mf1(int) In CMyClass::IMyInt2::mf2() In CMyClass::IMyInt2::mf2(int) ``` ## See also [Inheritance](../cpp/inheritance-cpp.md)

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