testBasicFunctors.cpp

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#include <iostream>
#include <cmath>
#include <functional>
 
#include "DGtal/base/Common.h"
 
#include "DGtal/base/CUnaryFunctor.h"
#include "DGtal/base/BasicFunctors.h"
 
 
using namespace std;
using namespace DGtal;
 
template <typename TFunctor, typename TArg, typename TRes >
void basicFunctorsConceptChecking()
{
  BOOST_CONCEPT_ASSERT(( concepts::CUnaryFunctor<TFunctor, TArg, TRes > ));
}
bool testBasicFunctors()
{
  unsigned int nbok = 0;
  unsigned int nb = 0;
  
  trace.beginBlock ( "Testing basic functors ..." );
  
  //default functor
  {
    functors::Identity f; 
    int a = 5; 
    nbok += ( f(a) == 5 ) ? 1 : 0; 
    nb++;
  }
 
  {//constant functor
    const int v = -1;
    DGtal::functors::ConstValue<int> f(v);
    char c = 'a'; 
    nbok += ( f(c) == v ) ? 1 : 0; 
    nb++;
    double d = 5.2; 
    nbok += ( f(d) == v ) ? 1 : 0; 
    nb++;
  }
 
  //cast functor
  {
    functors::Cast<int> f;
    char c = 'a'; 
    nbok += ( f(c) == 97 ) ? 1 : 0; 
    nb++;
  }
 
  //rounding functors
  {
    const double v1 = -3.5;
    const double v2 = 3.5;
 
    { const DGtal::functors::Round<double> f; nbok += ( f(v1) == -4. && f(v2) == 4. ) ? 1 : 0; }
    { const DGtal::functors::Round<> f;       nbok += ( f(v1) == -4. && f(v2) == 4. ) ? 1 : 0; }
    { const DGtal::functors::Floor<double> f; nbok += ( f(v1) == -4. && f(v2) == 3. ) ? 1 : 0; }
    { const DGtal::functors::Floor<> f;       nbok += ( f(v1) == -4. && f(v2) == 3. ) ? 1 : 0; }
    { const DGtal::functors::Ceil<double> f;  nbok += ( f(v1) == -3. && f(v2) == 4. ) ? 1 : 0; }
    { const DGtal::functors::Ceil<> f;        nbok += ( f(v1) == -3. && f(v2) == 4. ) ? 1 : 0; }
    { const DGtal::functors::Trunc<double> f; nbok += ( f(v1) == -3. && f(v2) == 3. ) ? 1 : 0; }
    { const DGtal::functors::Trunc<> f;       nbok += ( f(v1) == -3. && f(v2) == 3. ) ? 1 : 0; }
 
    nb += 8;
  }
 
  //composer quantizer
  {
    //need to explicitely specialized std::ptr_fun because there are several
    //overloaded versions of std::floor if used intead ctor of 
    //std::pointer_to_unary_function<double, double>
    // JOL: pointer_to_unary_function is deprecated as of C++11
    double (*pF)(double) = &floor;
    double (*pC)(double) = &ceil;
    std::function<double(double)> f = pF;
    std::function<double(double)> c = pC;
    functors::Cast<int> o;
 
    //composer
    typedef DGtal::functors::Composer< std::function<double(double)>,
    functors::Cast<int>, int > Quantizer;
    double d = 5.2; 
 
    Quantizer q(f, o); 
    nbok += ( q(d) == 5 ) ? 1 : 0; 
    nb++;
 
    Quantizer q2(c, o); 
    nbok += ( q2(d) == 6 ) ? 1 : 0; 
    nb++;
  }
 
  //binary to unary functor
  {
    int i = -5; 
    // With function and bind:
    std::function<int(int)> b = std::bind(std::minus<int>(), std::placeholders::_1, 0);
    //i - 0
    nbok += ( b(i) == -5 ) ? 1 : 0; 
    nb++;
    // With a lambda:
    auto b2 = [](int v) -> int {
      return v + 2;
    };
    //i + 2
    nbok += ( b2(i) == -3 ) ? 1 : 0; 
    nb++;
  }
 
  {//thresholder
    int i = -3; 
    DGtal::functors::Thresholder< int > t;
    nbok += ( t(i) == true ) ? 1 : 0; 
    nb++;    
    DGtal::functors::Thresholder< int, true, true > t1;
    nbok += ( t1(i) == true ) ? 1 : 0; 
    nb++;    
    DGtal::functors::Thresholder< int, true, false > t2;
    nbok += ( t2(0) == false ) ? 1 : 0; 
    nb++;    
    DGtal::functors::Thresholder< int, false, true > t3;
    nbok += ( t3(i) == false ) ? 1 : 0; 
    nb++;    
    DGtal::functors::Thresholder< int, false, false > t4;
    nbok += ( t4(i) == false ) ? 1 : 0; 
    nb++;    
  }
 
  {//interval thresholder
    const int low = 1;
    const int up = 5; 
    DGtal::functors::IntervalThresholder< int > t(low, up);
    nbok += ( t(0) == false ) ? 1 : 0; 
    nb++;    
    for (int i = low; i <= up; ++i)
      {
        nbok += ( t(i) == true ) ? 1 : 0; 
        nb++;    
      }
    nbok += ( t(6) == false ) ? 1 : 0; 
    nb++;    
  }
 
 
  trace.info() << "(" << nbok << "/" << nb << ") " << std::endl;
  trace.endBlock();
  
  return nbok == nb;
}
 
// Standard services - public :
 
int main( int argc, char** argv )
{
  trace.beginBlock ( "Testing basic functors" );
  trace.info() << "Args:";
  for ( int i = 0; i < argc; ++i )
    trace.info() << " " << argv[ i ];
  trace.info() << endl;
 
  //concept checking
  basicFunctorsConceptChecking<functors::Identity,int,int>(); 
  basicFunctorsConceptChecking<DGtal::functors::ConstValue<int>,int,int >();
  basicFunctorsConceptChecking<functors::Cast<int>,short,int >();
  basicFunctorsConceptChecking<DGtal::functors::Thresholder<int>,int,bool >();
  basicFunctorsConceptChecking<functors::Composer<functors::ConstValue<double>,functors::Cast<int>,int>,char,int >();
 
 
  //run-time tests
  bool res = testBasicFunctors();
  trace.emphase() << ( res ? "Passed." : "Error." ) << endl;
  trace.endBlock();
  return res ? 0 : 1;
}
//                                                                           //