(C++) RemoveExample1

 

Technical facts

 

Operating system(s) or programming environment(s)

• Lubuntu 13.10 (saucy)

IDE(s):

• Qt Creator unknown

Project type:

• Console application

C++ standard:

• C++11

Compiler(s):

• G++ 4.8.1

Libraries used:

• STL: GNU ISO C++ Library, version 4.8.1

 

 

 

 

 

Qt project file: ./CppRemoveExample1/CppRemoveExample1.pro

 

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TEMPLATE = app CONFIG += console CONFIG -= app_bundle CONFIG -= qt SOURCES += main.cpp QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++ unix {   QMAKE_CXXFLAGS += -Werror }

 

 

 

 

 

./CppRemoveExample1/main.cpp

 

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#include <algorithm> #include <cassert> #include <cstdio> #include <fstream> #include <iterator> #include <iostream> #include <vector> int main() {   //Remove elements from a std::vector   //using std::remove from algorithm.h   {     std::vector<int> v;     v.push_back(0);     v.push_back(42);     v.push_back(1);     v.push_back(42);     v.push_back(2);     v.push_back(42);     v.push_back(3);     std::cout << "v before std::remove: ";     std::copy(v.begin(),v.end(),std::ostream_iterator<int>(std::cout," "));     std::cout << std::endl;     const std::vector<int>::iterator new_end         = std::remove(v.begin(),v.end(),42);     std::cout << "v after std::remove, before erase: ";     std::copy(v.begin(),v.end(),std::ostream_iterator<int>(std::cout," "));     std::cout << std::endl;     v.erase(new_end,v.end());     std::cout << "v after erase: ";     std::copy(v.begin(),v.end(),std::ostream_iterator<int>(std::cout," "));     std::cout << std::endl;   }   //Remove a file using std::remove in cstdio.h   {     //Remove the possibly existing file     std::remove("test.txt");     //Try to delete the non-existing test.txt file     const bool deletion_failed = std::remove("test.txt");     assert(deletion_failed);   }   {     //Create the file test.txt     {       std::ofstream f("test.txt");       //Closes the file when f goes out of scope,       //std::remove fails when file is still open     }     //Delete it again     const bool deletion_failed = std::remove("test.txt");     assert(!deletion_failed);   } } /* Screen output: v before std::remove: 0 42 1 42 2 42 3 v after std::remove, before erase: 0 1 2 3 2 42 3 v after erase: 0 1 2 3 Press <RETURN> to close this window... */