turtle/doc/example/limitations_template_method.cpp

// http://turtle.sourceforge.net
//
// Copyright Mathieu Champlon 2014
//
// 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)

#include <boost/test/unit_test.hpp>
#include <turtle/mock.hpp>

namespace limitations_template_method_problem
{
//[ limitations_template_method_problem
class concept
{
public:
    template< typename T >
    void method( T t );
};

template< typename T >
void function_under_test( T t ) // T is supposed to model the previous concept
{
    t.method( 42 );
    t.method( "string" );
}
//]
 
//[ limitations_template_method_solution
MOCK_CLASS( mock_concept )
{
    MOCK_METHOD( method, 1, void( int ), method_int )
    MOCK_METHOD( method, 1, void( const char* ), method_string )
};
//]

BOOST_AUTO_TEST_CASE(mocked_templated_methods_are_called)
{
    mock_concept b;
    MOCK_EXPECT(b.method_int).once().with(42);
    MOCK_EXPECT(b.method_string).once().with(mock::equal(std::string("string")));
    function_under_test(b);
}
}

namespace limitations_template_method_problem_2
{
//[ limitations_template_method_problem_2
class concept
{
public:
    template< typename T >
    T create()
    {
        return T();
    }
};

template< typename T >
void function_under_test( T t ) // T is supposed to model the previous concept
{
    t.template create< int >();
    t.template create< std::string >();
}
//]
 
//[ limitations_template_method_solution_2
MOCK_CLASS( mock_concept )
{
    template< typename T >
    T create();

    MOCK_METHOD( create_int, 0, int(), create_int )
    MOCK_METHOD( create_string, 0, std::string(), create_string )
};

template<>
int mock_concept::create< int >()
{
    return create_int();
}
template<>
std::string mock_concept::create< std::string >()
{
    return create_string();
}
//]

BOOST_AUTO_TEST_CASE(dispatch_methods_are_called)
{
    mock_concept b;
    MOCK_EXPECT(b.create_int).once().returns(int{});
    MOCK_EXPECT(b.create_string).once().returns(std::string{});
    function_under_test(b);
}
}