Array example 6 is an array example.
Operating system(s) or programming environment(s)
Lubuntu 15.04 (vivid)
Qt Creator 3.1.1
- G++ 4.9.2
Libraries used:
Qt project file: ./CppArrayExample6/CppArrayExample6.pro
QMAKE_CXXFLAGS += -std=c++1y -Wall -Wextra QT += core QT += gui CONFIG += console CONFIG -= app_bundle TEMPLATE = app include(../../Libraries/Boost.pri) SOURCES += main.cpp
#include <boost/date_time/posix_time/ptime.hpp> #include <boost/date_time/microsec_time_clock.hpp> #include <iostream> const int sz = 100000; struct Individual { Individual() : m_v{std::vector<int>(1000,0)} { } void Add() noexcept { ++m_v[0]; } private: std::vector<int> m_v; //Make copying heavy }; void f(Individual v[sz]) { for (int i=0; i!=sz; ++i) { v[i].Add(); } } void g(Individual * const v) { for (int i=0; i!=sz; ++i) { v[i].Add(); } } int main() { Individual v[sz]; const boost::posix_time::ptime start{boost::date_time::microsec_clock<boost::posix_time::ptime>::local_time()}; f(v); const boost::posix_time::ptime after_f(boost::date_time::microsec_clock<boost::posix_time::ptime>::local_time()); g(v); const boost::posix_time::ptime after_g(boost::date_time::microsec_clock<boost::posix_time::ptime>::local_time()); const boost::posix_time::time_duration d_f = after_f - start; const boost::posix_time::time_duration d_g = after_g - start; std::cout << d_f.total_microseconds() << " " << d_g.total_microseconds() << '\n' ; }