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(C++) StdSwapExample2

 

Technical facts

 

Operating system(s) or programming environment(s)

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C++ standard:

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Qt project file: ./CppStdSwapExample2/CppStdSwapExample2.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

 

 

 

 

 

./CppStdSwapExample2/main.cpp

 

#include <algorithm>
#include <cassert>
#include <vector>

int main()
{
  std::vector<int> v { 0,1,2 };
  // {0,1,2} -> {2,1,0}
  //  ^                  x
  //      ^              v.back()
  //
  // {2,1,0} -> {2,0,1}
  //    ^                x
  //      ^              v.back()
  //
  // {2,0,1} -> {2,0,1}
  //      ^              x
  //      ^              v.back()
  //
  for (int& x: v)
  {
    std::swap(x,v.back());
  }

  const std::vector<int> expected { 2,0,1 };
  assert(v == expected);
}

 

 

 

 

 

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