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: ./CppGetKeyWithMaxValue/CppGetKeyWithMaxValue.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

./CppGetKeyWithMaxValue/main.cpp


#include <algorithm>

#include <cassert>

#include <map>



#include <iostream>

#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#include <boost/lambda/bind.hpp>

#include <boost/lambda/lambda.hpp>

#pragma GCC diagnostic pop



///Obtain the key that corresponds to the highest value

//From http://www.richelbilderbeek.nl/CppGetKeyWithMaxValue.htm

template <class Key, class Value>

const Key GetKeyWithMaxValue(const std::map<Key,Value>& v)

{

  assert(!v.empty());

  return std::max_element(

    v.begin(),v.end(),

    boost::lambda::bind(&std::pair<Key,Value>::second, boost::lambda::_2)

     > boost::lambda::bind(&std::pair<Key,Value>::second, boost::lambda::_1)

   )->first;

}



int main()

{

  std::map<std::string,int> m;

  m.insert(std::make_pair("eight",8));

  m.insert(std::make_pair("four",4));

  m.insert(std::make_pair("one",1));

  m.insert(std::make_pair("sixteen",16));

  m.insert(std::make_pair("two",2));

  assert(GetKeyWithMaxValue(m) == "sixteen");

}

Go back to Richel Bilderbeek's C++ page.

Go back to Richel Bilderbeek's homepage.

This page has been created by the tool CodeToHtml

(C++) GetKeyWithMaxValue

Technical facts

Qt project file: ./CppGetKeyWithMaxValue/CppGetKeyWithMaxValue.pro

./CppGetKeyWithMaxValue/main.cpp