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/*
* Copyright Andrey Semashev 2007 - 2015.
* 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)
*/
/*!
* \file attr_function.cpp
* \author Andrey Semashev
* \date 25.01.2009
*
* \brief This header contains tests for the function attribute.
*/
#define BOOST_TEST_MODULE attr_function
#include <string>
#include <boost/mpl/vector.hpp>
#include <boost/utility/result_of.hpp>
#include <boost/test/unit_test.hpp>
#include <boost/log/attributes/function.hpp>
#include <boost/log/utility/type_dispatch/static_type_dispatcher.hpp>
namespace logging = boost::log;
namespace attrs = logging::attributes;
namespace {
// Type dispatcher for the supported types
struct my_dispatcher :
public logging::static_type_dispatcher<
boost::mpl::vector< int, std::string >
>
{
typedef logging::static_type_dispatcher<
boost::mpl::vector< int, std::string >
> base_type;
enum type_expected
{
none_expected,
int_expected,
string_expected
};
my_dispatcher() : base_type(*this), m_Expected(none_expected), m_Int(0) {}
void set_expected()
{
m_Expected = none_expected;
}
void set_expected(int value)
{
m_Expected = int_expected;
m_Int = value;
}
void set_expected(std::string const& value)
{
m_Expected = string_expected;
m_String = value;
}
// Implement visitation logic for all supported types
void operator() (int const& value) const
{
BOOST_CHECK_EQUAL(m_Expected, int_expected);
BOOST_CHECK_EQUAL(m_Int, value);
}
void operator() (std::string const& value) const
{
BOOST_CHECK_EQUAL(m_Expected, string_expected);
BOOST_CHECK_EQUAL(m_String, value);
}
private:
type_expected m_Expected;
int m_Int;
std::string m_String;
};
// A test function that returns an attribute value
int get_attr_value()
{
return 10;
}
// A test functional object that returns an attribute value
struct attr_value_generator
{
typedef std::string result_type;
explicit attr_value_generator(unsigned int& count) : m_CallsCount(count) {}
result_type operator() () const
{
++m_CallsCount;
return "Hello, world!";
}
private:
unsigned int& m_CallsCount;
};
} // namespace
// The test verifies that the attribute calls the specified functor and returns the value returned by the functor
BOOST_AUTO_TEST_CASE(calling)
{
unsigned int call_count = 0;
my_dispatcher disp;
logging::attribute attr1 =
#ifndef BOOST_NO_RESULT_OF
attrs::make_function(&get_attr_value);
#else
attrs::make_function< int >(&get_attr_value);
#endif
logging::attribute attr2 =
#ifndef BOOST_NO_RESULT_OF
attrs::make_function(attr_value_generator(call_count));
#else
attrs::make_function< std::string >(attr_value_generator(call_count));
#endif
logging::attribute_value p1(attr1.get_value());
logging::attribute_value p2(attr2.get_value());
BOOST_CHECK_EQUAL(call_count, 1);
logging::attribute_value p3(attr2.get_value());
BOOST_CHECK_EQUAL(call_count, 2);
disp.set_expected(10);
BOOST_CHECK(p1.dispatch(disp));
BOOST_CHECK(p1.dispatch(disp)); // check that the contained value doesn't change over time or upon dispatching
disp.set_expected("Hello, world!");
BOOST_CHECK(p2.dispatch(disp));
BOOST_CHECK(p3.dispatch(disp));
}
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