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/* ----------------------------------------------------------------------------
* GTSAM Copyright 2010, Georgia Tech Research Corporation,
* Atlanta, Georgia 30332-0415
* All Rights Reserved
* Authors: Frank Dellaert, et al. (see THANKS for the full author list)
* See LICENSE for the license information
* -------------------------------------------------------------------------- */
/**
* @file timeVirtual.cpp
* @brief Time the overhead of using virtual destructors and methods
* @author Richard Roberts
* @date Nov 6, 2011
*/
#include <gtsam/base/timing.h>
#include <boost/shared_ptr.hpp>
#include <boost/intrusive_ptr.hpp>
#include <iostream>
using namespace std;
using namespace boost;
using namespace gtsam;
struct DtorTestBase {
DtorTestBase() { cout << " DtorTestBase" << endl; }
virtual ~DtorTestBase() { cout << " ~DtorTestBase" << endl; }
};
struct DtorTestDerived : public DtorTestBase {
DtorTestDerived() { cout << " DtorTestDerived" << endl; }
~DtorTestDerived() override { cout << " ~DtorTestDerived" << endl; }
};
struct VirtualBase {
VirtualBase() { }
virtual void method() = 0;
virtual ~VirtualBase() { }
};
struct VirtualDerived : public VirtualBase {
double data;
VirtualDerived() { data = rand(); }
void method() override { data = rand(); }
~VirtualDerived() override { }
};
struct NonVirtualBase {
NonVirtualBase() { }
~NonVirtualBase() { }
};
struct NonVirtualDerived : public NonVirtualBase {
double data;
NonVirtualDerived() { data = rand(); }
void method() { data = rand(); }
~NonVirtualDerived() { }
};
int main(int argc, char *argv[]) {
// Virtual destructor test
cout << "Stack objects:" << endl;
cout << "Base:" << endl;
{ DtorTestBase b; }
cout << "Derived:" << endl;
{ DtorTestDerived d; }
cout << "Heap objects:" << endl;
cout << "Base:" << endl;
{ DtorTestBase *b = new DtorTestBase(); delete b; }
cout << "Derived:" << endl;
{ DtorTestDerived *d = new DtorTestDerived(); delete d; }
cout << "Derived with base pointer:" << endl;
{ DtorTestBase *b = new DtorTestDerived(); delete b; }
int n = 10000000;
{
VirtualBase** b = new VirtualBase*[n];
gttic_(Virtual);
gttic_(new);
for(int i=0; i<n; ++i)
b[i] = new VirtualDerived();
gttoc_(new);
gttic_(method);
for(int i=0; i<n; ++i)
b[i]->method();
gttoc_(method);
gttic_(dynamic_cast);
for(int i=0; i<n; ++i) {
VirtualDerived* d = dynamic_cast<VirtualDerived*>(b[i]);
if(d)
d->method();
}
gttoc_(dynamic_cast);
gttic_(delete);
for(int i=0; i<n; ++i)
delete b[i];
gttoc_(delete);
gttoc_(Virtual);
delete[] b;
}
{
NonVirtualDerived** d = new NonVirtualDerived*[n];
gttic_(NonVirtual);
gttic_(new);
for(int i=0; i<n; ++i)
d[i] = new NonVirtualDerived();
gttoc_(new);
gttic_(method);
for(int i=0; i<n; ++i)
d[i]->method();
gttoc_(method);
gttic_(dynamic_cast_does_nothing);
for(int i=0; i<n; ++i)
d[i]->method();
gttoc_(dynamic_cast_does_nothing);
gttic_(delete);
for(int i=0; i<n; ++i)
delete d[i];
gttoc_(delete);
gttoc_(NonVirtual);
delete[] d;
}
tictoc_finishedIteration_();
tictoc_print_();
return 0;
}
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