The following code example is taken from the book
C++ Templates - The Complete Guide, 2nd Edition
by David Vandevoorde, Nicolai M. Josuttis, and Douglas Gregor,
Addison-Wesley, 2017
© Copyright David Vandevoorde, Nicolai M. Josuttis, Douglas Gregor 2017
#include <iostream>
#include <algorithm>
#include "tracer.hpp"
int main()
{
// prepare sample input:
SortTracer input[] = { 7, 3, 5, 6, 4, 2, 0, 1, 9, 8 };
// print initial values:
for (int i=0; i<10; ++i) {
std::cerr << input[i].val() << ' ';
}
std::cerr << '\n';
// remember initial conditions:
long created_at_start = SortTracer::creations();
long max_live_at_start = SortTracer::max_live();
long assigned_at_start = SortTracer::assignments();
long compared_at_start = SortTracer::comparisons();
// execute algorithm:
std::cerr << "---[ Start std::sort() ]--------------------\n";
std::sort<>(&input[0], &input[9]+1);
std::cerr << "---[ End std::sort() ]----------------------\n";
// verify result:
for (int i=0; i<10; ++i) {
std::cerr << input[i].val() << ' ';
}
std::cerr << "\n\n";
// final report:
std::cerr << "std::sort() of 10 SortTracer's"
<< " was performed by:\n "
<< SortTracer::creations() - created_at_start
<< " temporary tracers\n "
<< "up to "
<< SortTracer::max_live()
<< " tracers at the same time ("
<< max_live_at_start << " before)\n "
<< SortTracer::assignments() - assigned_at_start
<< " assignments\n "
<< SortTracer::comparisons() - compared_at_start
<< " comparisons\n\n";
}