Daviddoria at 17:05, 9 February 2011

2011-02-09T17:05:48Z

Daviddoria: Created page with '==Map.cpp== #include #include #include #include void Array2Vec(unsigned char arr[3], std::vector &out); …'

2010-06-22T20:24:45Z

Created page with '==Map.cpp== <source lang="cmake"> #include <iostream> #include <map> #include <vector> #include <string> void Array2Vec(unsigned char arr[3], std::vector<unsigned char> &out); …'

New page

==Map.cpp==
<source lang="cmake">
#include <iostream>
#include <map>
#include <vector>
#include <string>

void Array2Vec(unsigned char arr[3], std::vector<unsigned char> &out);

void Colors();
void Strings();
void SetValue();
void SetAndGetValue();
void NonExistentValue();
void ResetValue();
void StringConst();
void IterateOverWholeMap();

int main(int argc, char *argv[])
{
//SetValue();
//SetAndGetValue();
//NonExistentValue();
//ResetValue();

// Strings();
// Colors();
IterateOverWholeMap();
return 0;
}

void SetValue()
{
//create a map
std::map <std::string, int> MyMap;

//create a mapping from "test" to 111
MyMap["test"] = 111;
}

void SetAndGetValue()
{
//create a map
std::map <std::string, int> MyMap;

//create a mapping from "testone" to 111
MyMap["testone"] = 111;

//create an iterator
std::map<std::string,int>::iterator iter;

//try to find "testone"
iter = MyMap.find("testone");

//we assume "testone" was found, so output the value that "testone" maps to
std::cout << iter->second << std::endl;
}

void ResetValue()
{
std::string Name = "testone";
std::map <std::string, int> MyMap;
MyMap[Name] = 111;

std::map<std::string,int>::iterator iter;

iter = MyMap.find(Name);

double FirstValue = iter->second;
std::cout << FirstValue << std::endl;

MyMap[Name] = FirstValue + 1;

double SecondValue = iter->second;
std::cout << SecondValue << std::endl;

}

void NonExistentValue()
{
std::map <std::string, int> MyMap;
MyMap["testone"] = 111;

std::map<std::string,int>::iterator iter;

iter = MyMap.find("testone");

if(iter == MyMap.end())
{
std::cout << "Element not found!" << std::endl;
}
else
{
std::cout << "Element found!" << std::endl;
std::cout << iter->second << std::endl;
}
}

void Strings()
{
std::map <std::string, int> MyMap;
MyMap["testone"] = 111;
MyMap["testtwo"] = 222;
MyMap["testseventyeight"] = 78;

//tests
std::cout << "Tests:" << std::endl;
std::cout << MyMap["testtwo"] << std::endl;
std::cout << MyMap["testseventyeight"] << std::endl;

std::cout << MyMap["not in map 1"] << std::endl;
std::cout << MyMap["not in map 2"] << std::endl;
/*
if(MyMap["not in map"] == NULL)
cout << "NULL" << endl;

if(MyMap["testone"] == NULL)
cout << "SHOULD NOT SEE THIS!" << endl;
*/
std::map<std::string,int>::iterator iter;

iter = MyMap.find("testone");
if(iter == MyMap.end())
std::cout << "NO ELEMENT" << std::endl;
else
std::cout << iter->second << std::endl;

iter = MyMap.find("hello");
if(iter == MyMap.end())
std::cout << "NO ELEMENT" << std::endl;
else
std::cout << iter->second << std::endl;

//get all items in the map
std::cout << "All items:" << std::endl;

std::map<std::string, int>::iterator alliter = MyMap.begin();
for( ; alliter != MyMap.end(); ++alliter )
{
std::cout << alliter->first << " " << alliter->second << std:: endl;
}

}

void Colors()
{
unsigned char r[3] = {255, 0, 0};
unsigned char g[3] = {0, 255, 0};
unsigned char b[3] = {0, 0, 255};

std::vector<unsigned char> red(3,0);
red[0] = 255;

std::vector<unsigned char> green(3,0);
green[1] = 255;

std::vector<unsigned char> blue(3,0);
blue[2] = 255;

std::map<std::vector<unsigned char>, int> ColorList;
ColorList[red] = 1;
ColorList[green] = 2;
ColorList[blue] = 3;

std::cout << ColorList[red] << std::endl
<< ColorList[green] << std::endl
<< ColorList[blue] << std::endl;

std::vector<unsigned char> RedVec(3);
std::vector<unsigned char> GreenVec(3);
std::vector<unsigned char> BlueVec(3);

Array2Vec(r, RedVec);
Array2Vec(g, GreenVec);
Array2Vec(b, BlueVec);

std::cout << ColorList[RedVec] << std::endl
<< ColorList[GreenVec] << std::endl
<< ColorList[BlueVec] << std::endl;

}
void Array2Vec(unsigned char arr[3], std::vector<unsigned char> &out)
{
for(int i = 0; i <= 2; i++)
{
out[i] = arr[i];
}

}

void IterateOverWholeMap()
{
std::map <std::string, int> myMap;
myMap["testone"] = 111;
myMap["testtwo"] = 222;

std::map<std::string,int>::iterator iter = myMap.begin();

for(; iter != myMap.end(); ++iter)
{
std::cout << iter->first << " " << iter->second << std::endl;
}
}
</source>

@@ Line 1: / Line 1: @@
 ==Map.cpp==
-<source lang="cmake">
+<source lang="cpp">
 #include <iostream>
 #include <map>

CPP/STL/Map - Revision history

Daviddoria at 17:05, 9 February 2011

Daviddoria: Created page with '==Map.cpp== #include #include #include #include void Array2Vec(unsigned char arr[3], std::vector &out); …'