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: ./CppStdRefExample1/CppStdRefExample1.pro


TEMPLATE = app

CONFIG += console

CONFIG -= app_bundle

CONFIG -= qt

QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Werror

SOURCES += main.cpp

./CppStdRefExample1/main.cpp


#include <cassert>

#include <functional>



int main()

{

  int a = 42;



  //Reference-wrap a

  const std::reference_wrapper<int> b(a);



  //Const-reference-wrap the reference-wrap of a

  const std::reference_wrapper<const int> c(b);



  //Cannot do a non-const wrap around const-wrap c

  //const boost::reference_wrapper<int> d(c); //Won't compile



  assert(a == 42 && a == b && b == c);

  ++a;

  assert(a == 43 && a == b && b == c);

  ++b;

  assert(a == 44 && a == b && b == c);



  //Cannot modify a const-wrap

  //++c; //Won't compile

}

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(C++) StdRefExample1

Technical facts

Qt project file: ./CppStdRefExample1/CppStdRefExample1.pro

./CppStdRefExample1/main.cpp