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: ./CppBoostRefExample1/CppBoostRefExample1.pro


include(../../ConsoleApplication.pri) #Or use the code below

# QT += core

# QT += gui

# greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

# CONFIG   += console

# CONFIG   -= app_bundle

# TEMPLATE = app

# CONFIG(release, debug|release) {

#   DEFINES += NDEBUG NTRACE_BILDERBIKKEL

# }

# QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

# unix {

#   QMAKE_CXXFLAGS += -Werror

# }



include(../../Libraries/Boost.pri) #Or use the code below

# win32 {

#   INCLUDEPATH += \

#     ../../Libraries/boost_1_54_0

# }



SOURCES += main.cpp

./CppBoostRefExample1/main.cpp


#include <cassert>



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#include <boost/ref.hpp>

#pragma GCC diagnostic pop



int main()

{

  int a = 42;



  //Reference-wrap a

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



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

  const boost::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++) BoostRefExample1

Technical facts

Qt project file: ./CppBoostRefExample1/CppBoostRefExample1.pro

./CppBoostRefExample1/main.cpp