StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
text
Body
copied!<pre><code>template<template<typename> class F, int X> class BarInterface : private enable_crtp< F<X> > { // interface void bar() { self()->do_bar(); } }; </code></pre> <p>i guess </p> <pre><code> template<template<int > class F, int X> class BarInterface : private enable_crtp< F<X> > { // interface void bar() { self()->do_bar(); } }; </code></pre> <p>then you need fix two error about access private member function</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 : private enable_crtp< FX > { public: // interface void foo() { 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 : private enable_crtp< F<X> > { // interface public: void bar() { self()->do_bar(); } }; template< int X > class BarImpl : public BarInterface< BarImpl, X > { private: // implementation friend class BarInterface< ::BarImpl, X >; void do_bar() { 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>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload