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// Boost.Function library

// Copyright Douglas Gregor 2001-2003. Use, modification and

// distribution is subject to 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)

// For more information, see http://www.boost.org

#include <boost/function.hpp>

#include <boost/core/lightweight_test.hpp>

#include <cassert>

#include <functional>

using namespace std;

using namespace boost;

static int alloc_count = 0;

static int dealloc_count = 0;

template<typename T>

struct counting_allocator : public std::allocator<T>

{

template<typename U>

struct rebind

{

typedef counting_allocator<U> other;

};

counting_allocator()

{

}

template<typename U>

counting_allocator( counting_allocator<U> )

{

}

T* allocate(std::size_t n)

{

alloc_count++;

return std::allocator<T>::allocate(n);

}

void deallocate(T* p, std::size_t n)

{

dealloc_count++;

std::allocator<T>::deallocate(p, n);

}

};

struct enable_small_object_optimization

{

};

struct disable_small_object_optimization

{

int unused_state_data[32];

};

template <typename base>

struct plus_int: base

{

int operator()(int x, int y) const { return x + y; }

};

static int do_minus(int x, int y) { return x-y; }

template <typename base>

struct DoNothing: base

{

void operator()() const {}

};

static void do_nothing() {}

int main()

{

function2<int, int, int> f;

f.assign( plus_int<disable_small_object_optimization>(), counting_allocator<int>() );

f.clear();

BOOST_TEST_EQ( alloc_count, 1 );

BOOST_TEST_EQ( dealloc_count, 1 );

alloc_count = 0;

dealloc_count = 0;

f.assign( plus_int<enable_small_object_optimization>(), counting_allocator<int>() );

f.clear();

BOOST_TEST_EQ( alloc_count, 0 );

BOOST_TEST_EQ( dealloc_count, 0 );

f.assign( plus_int<disable_small_object_optimization>(), std::allocator<int>() );

f.clear();

f.assign( plus_int<enable_small_object_optimization>(), std::allocator<int>() );

f.clear();

alloc_count = 0;

dealloc_count = 0;

f.assign( &do_minus, counting_allocator<int>() );

f.clear();

BOOST_TEST_EQ( alloc_count, 0 );

BOOST_TEST_EQ( dealloc_count, 0 );

f.assign( &do_minus, std::allocator<int>() );

f.clear();

function0<void> fv;

alloc_count = 0;

dealloc_count = 0;

fv.assign( DoNothing<disable_small_object_optimization>(), counting_allocator<int>() );

fv.clear();

BOOST_TEST_EQ( alloc_count, 1 );

BOOST_TEST_EQ( dealloc_count, 1 );

alloc_count = 0;

dealloc_count = 0;

fv.assign( DoNothing<enable_small_object_optimization>(), counting_allocator<int>() );

fv.clear();

BOOST_TEST_EQ( alloc_count, 0 );

BOOST_TEST_EQ( dealloc_count, 0 );

fv.assign( DoNothing<disable_small_object_optimization>(), std::allocator<int>() );

fv.clear();

fv.assign( DoNothing<enable_small_object_optimization>(), std::allocator<int>() );

fv.clear();

alloc_count = 0;

dealloc_count = 0;

fv.assign( &do_nothing, counting_allocator<int>() );

fv.clear();

BOOST_TEST_EQ( alloc_count, 0 );

BOOST_TEST_EQ( dealloc_count, 0 );

fv.assign( &do_nothing, std::allocator<int>() );

fv.clear();

function0<void> fv2;

fv.assign(&do_nothing, std::allocator<int>() );

fv2.assign(fv, std::allocator<int>() );

return boost::report_errors();

}

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