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// (C) Copyright Gennadiy Rozental 2001-2006.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/test for the library home page.
// Boost.Test
#include <boost/test/unit_test.hpp>
#include <boost/test/floating_point_comparison.hpp>
#include <boost/test/parameterized_test.hpp>
using namespace boost::unit_test;
// BOOST
#include <boost/functional.hpp>
#include <boost/static_assert.hpp>
#include <boost/mem_fn.hpp>
#include <boost/bind.hpp>
// STL
#include <string>
#include <stdexcept>
#include <algorithm>
#include <functional>
#include <iostream>
#include <memory>
#include <list>
//____________________________________________________________________________//
template<int n>
struct power_of_10 {
BOOST_STATIC_CONSTANT( unsigned long, value = 10*power_of_10<n-1>::value );
};
template<>
struct power_of_10<0> {
BOOST_STATIC_CONSTANT( unsigned long, value = 1 );
};
//____________________________________________________________________________//
template<int AlphabetSize>
class hash_function {
public:
BOOST_STATIC_ASSERT( AlphabetSize <= 5 );
explicit hash_function( std::string const& alphabet )
: m_alphabet( alphabet )
{
if( m_alphabet.size() != AlphabetSize )
throw std::runtime_error( "Wrong alphabet size" );
std::sort( m_alphabet.begin(), m_alphabet.end() );
if( std::adjacent_find( m_alphabet.begin(), m_alphabet.end() ) != m_alphabet.end() )
throw std::logic_error( "Duplicate characters in alphabet" );
}
unsigned long operator()( std::string const& arg )
{
m_result = 0;
if( arg.length() > 8 )
throw std::runtime_error( "Wrong argument size" );
std::string::const_iterator it = std::find_if( arg.begin(), arg.end(),
std::bind1st( boost::mem_fun( &hash_function::helper_ ), this ) );
if( it != arg.end() )
throw std::out_of_range( std::string( "Invalid character " ) + *it );
return m_result;
}
private:
bool helper_( char c )
{
std::string::const_iterator it = std::find( m_alphabet.begin(), m_alphabet.end(), c );
if( it == m_alphabet.end() )
return true;
m_result += power_of_10_( it - m_alphabet.begin() );
return false;
}
unsigned long power_of_10_( int i ) {
switch( i ) {
case 0: return power_of_10<0>::value;
case 1: return power_of_10<1>::value;
case 2: return power_of_10<2>::value;
case 3: return power_of_10<3>::value;
case 4: return power_of_10<4>::value;
default: return 0;
}
}
// Data members
std::string m_alphabet;
unsigned long m_result;
};
//____________________________________________________________________________//
struct hash_function_test_data {
std::string orig_string;
unsigned long exp_value;
friend std::istream& operator>>( std::istream& istr, hash_function_test_data& test_data )
{
std::istream& tmp = istr >> test_data.orig_string;
return !tmp ? tmp : istr >> test_data.exp_value;
}
};
//____________________________________________________________________________//
class hash_function_tester {
public:
explicit hash_function_tester( std::string const& alphabet )
: m_function_under_test( alphabet ) {}
void test( hash_function_test_data const& test_data )
{
if( test_data.exp_value == (unsigned long)-1 )
BOOST_CHECK_THROW( m_function_under_test( test_data.orig_string ), std::runtime_error )
else if( test_data.exp_value == (unsigned long)-2 )
BOOST_CHECK_THROW( m_function_under_test( test_data.orig_string ), std::out_of_range )
else {
BOOST_TEST_MESSAGE( "Testing: " << test_data.orig_string );
BOOST_CHECK_EQUAL( m_function_under_test( test_data.orig_string ), test_data.exp_value );
}
}
private:
hash_function<4> m_function_under_test;
};
//____________________________________________________________________________//
struct massive_hash_function_test : test_suite {
massive_hash_function_test() : test_suite( "massive_hash_function_test" ) {
std::string alphabet;
std::cout << "Enter alphabet (4 characters without delimeters)\n";
std::cin >> alphabet;
boost::shared_ptr<hash_function_tester> instance( new hash_function_tester( alphabet ) );
std::cout << "\nEnter test data in a format [string] [value] to check correct calculation\n";
std::cout << "Enter test data in a format [string] -1 to check long string validation\n";
std::cout << "Enter test data in a format [string] -2 to check invalid argument string validation\n";
std::list<hash_function_test_data> test_data_store;
while( !std::cin.eof() ) {
hash_function_test_data test_data;
if( !(std::cin >> test_data) )
break;
test_data_store.push_back( test_data );
}
add( make_test_case( &hash_function_tester::test,
"hash_function_tester",
instance,
test_data_store.begin(),
test_data_store.end() ) );
}
};
//____________________________________________________________________________//
test_suite*
init_unit_test_suite( int, char* [] ) {
framework::master_test_suite().p_name.value = "Unit test example 12";
framework::master_test_suite().add( new massive_hash_function_test );
return 0;
}
//____________________________________________________________________________//
// EOF
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