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(C++) Boost Boost.Ref example 1: basics

 

Boost.Ref example 1: basics is a Boost.Ref example showing some the basic use.

 

 

 

 

 

 

Technical facts

 

Operating system(s) or programming environment(s)

IDE(s):

Project type:

C++ standard:

Compiler(s):

Libraries used:

 

 

 

 

 

Qt project file: CppRefExample1.pro

 

TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt

SOURCES += main.cpp

 

 

 

 

 

main.cpp

 

#include <cassert>
#include <boost/ref.hpp>

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
}

 

 

 

 

 

crosscompiletowindows.sh

 

#!/bin/sh
#From http://richelbilderbeek.nl/CppQtCrosscompileToWindowsExample15.htm

echo "Cross compiling to Windows"

echo "1/2: Creating Windows makefile"
i686-pc-mingw32-qmake CppRefExample1.pro

echo "2/2: making makefile"

make

echo "Done"

 

 

 

 

 

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