(C++) StdUnique_ptrExample2

 

 

std::unique_ptr example 2: custom deleter is a std::unique_ptr example that shows how to use a custom deleter (in this case boost::checked_delete) with auto and std::function

 

• Download the Qt Creator project 'CppUnique_ptrExample2' (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++11

Compiler(s):

• G++ 4.9.2

Libraries used:

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

 

 

 

 

 

Qt project file: ./CppStdUnique_ptrExample2/CppStdUnique_ptrExample2.pro

 

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TEMPLATE = app CONFIG += console CONFIG -= app_bundle CONFIG -= qt SOURCES += main.cpp # # # Type of compile # # CONFIG(release, debug|release) {   DEFINES += NDEBUG NTRACE_BILDERBIKKEL } QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++ unix {   QMAKE_CXXFLAGS += -Werror } # # # Boost # # win32 {   INCLUDEPATH += \     ../../Libraries/boost_1_54_0 }

 

 

 

 

 

./CppStdUnique_ptrExample2/main.cpp

 

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#include <iostream> #include <boost/checked_delete.hpp> #include <boost/scoped_ptr.hpp> struct MyClass {   MyClass() {}   static void Deleter(const MyClass * const p) { boost::checked_delete(p); }   private:   ~MyClass() { std::cout << "Destructor" << '\n'; }   friend void boost::checked_delete<>(MyClass* x);   friend void boost::checked_delete<>(const MyClass* x); }; int main() {   {     //Use of auto and lambda expression     const auto deleter       = [](const MyClass * const p)       {         boost::checked_delete(p);       };     const std::unique_ptr<const MyClass, decltype(deleter)> p {       new MyClass,deleter     };   }   {     //Use of std::function and static member function     const std::function<void(const MyClass * const)> deleter = MyClass::Deleter;     const std::unique_ptr<const MyClass, decltype(deleter)> p {       new MyClass,deleter     };   } } /* Screen output Destructor Destructor Press <RETURN> to close this window... */