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11571808
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2012-07-20T01:54:15.503
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2012-07-20T01:54:15.503
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<p>Sorry, but I remake this code for GCC-4.4 and can't check for VC 2010. Errors:</p> <ol> <li><p>Wrong template class declaration in template BarInterface -- replace <code>typename</code> to <code>int</code>: <code>template<template<int> class F, int X> class BarInterface</code></p></li> <li><p>Set public to <code>foo()</code> and <code>bar()</code> method: <code>public: void xxx() { self()->do_xxx(); }</code></p></li> <li>Set public for base class <code>enable_crtp<FX></code> in classes <code>BarInterface</code> and <code>FooInterface</code>: <code>public enable_crtp< FX ></code></li> <li>Add scope specification for calling <code>self()</code> method in <code>foo()</code> and <code>bar()</code> methods: <code>void xxx() { enable_crtp<FX>::self()->do_xxx(); }</code></li> </ol> <p>And finally I get working code:</p> <pre><code>template<typename Derived> struct enable_crtp { private: // typedefs typedef enable_crtp Base; public: // casting "down" the inheritance hierarchy Derived const* self() const { return static_cast<Derived const*>(this); } // write the non-const version in terms of the const version // Effective C++ 3rd ed., Item 3 (p. 24-25) Derived* self() { return const_cast<Derived*>(static_cast<Base const*>(this)->self()); } protected: // disable deletion of Derived* through Base* // enable deletion of Base* through Derived* ~enable_crtp() { // no-op } }; template<typename FX> class FooInterface : public enable_crtp< FX > { public: // interface void foo() { enable_crtp<FX>::self()->do_foo(); } }; class FooImpl : public FooInterface< FooImpl > { private: // implementation friend class FooInterface< FooImpl > ; void do_foo() { std::cout << "Foo\n"; } }; class AnotherFooImpl : public FooInterface< AnotherFooImpl > { private: // implementation friend class FooInterface< AnotherFooImpl >; void do_foo() { std::cout << "AnotherFoo\n"; } }; template<template<int> class F, int X> class BarInterface : public enable_crtp< F<X> > { public: // interface void bar() { enable_crtp< F<X> >::self()->do_bar(); } }; template< int X > class BarImpl : public BarInterface< BarImpl, X > { private: // implementation friend class BarInterface< ::BarImpl, X >; void do_bar() const { std::cout << X << "\n"; } }; int main() { FooImpl f1; AnotherFooImpl f2; BarImpl< 1 > b1; BarImpl< 2 > b2; f1.foo(); f2.foo(); b1.bar(); b2.bar(); return 0; } </code></pre>
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1. POThis template code will not compile. Any ideas?
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1. POThis template code will not compile. Any ideas?
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1. COThanks! I spaced on the int / typename thing.
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2. CO@Lex +1 this answer. In my answer http://stackoverflow.com/a/11547473/819272 to the original question by Tavison, I had indeed used some Microsoft specific features such as dependent name lookup in base classes. This is now fixed in the answer. Thanks for your corrections. (I didn't notice this thread until now.)
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