(C++) TemplateClassExample7

 

 

Template class example 7: copy policy of template class type, two partially specialized classes is a template class example.

 

• Download the Qt Creator project 'CppTemplateClassExample7' (zip)

Technical facts

 

Operating system(s) or programming environment(s)

• Lubuntu 15.04 (vivid)

IDE(s):

• Qt Creator 3.1.1

Project type:

• Console application

C++ standard:

• C++98

Compiler(s):

• G++ 4.9.2

Libraries used:

• STL: GNU ISO C++ Library, version 4.9.2

 

 

 

 

 

Qt project file: ./CppTemplateClassExample7/CppTemplateClassExample7.pro

 

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include(../../ConsoleApplication.pri) include(../../Libraries/Boost.pri) SOURCES += main.cpp

 

 

 

 

 

./CppTemplateClassExample7/main.cpp

 

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//Does not compile // //Unknown how to compile this enum class CopyPolicy { allow, forbid }; template <class T, CopyPolicy copy_policy> struct MyClass {   //All MyClass template classes must have a same constructor   MyClass<T,copy_policy>(const T& x) : m_x(x) {}   private:   T m_x; }; template <class T> struct MyClass<T,CopyPolicy::forbid> {   MyClass<T,CopyPolicy::forbid>(const MyClass<T,CopyPolicy::forbid>&) = delete;   MyClass<T,CopyPolicy::forbid>& operator=(const MyClass<T,CopyPolicy::forbid>&) = delete; }; template <class T> struct MyClass<T,CopyPolicy::allow> { }; int main() {   const MyClass<int,CopyPolicy::allow > a(123); //Use general constructor: Does not compile   const MyClass<int,CopyPolicy::forbid> b(123); //Use general constructor: Does not compile   const decltype(a) c(a); //Should compile   const decltype(b) d(b); //Should not compile }