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// (C) Copyright Gennadiy Rozental 2005-2008.
// 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.
//
// File : $RCSfile$
//
// Version : $Revision$
//
// Description : defines model of program environment variable
// ***************************************************************************
#ifndef BOOST_RT_ENV_VARIABLE_HPP_062604GER
#define BOOST_RT_ENV_VARIABLE_HPP_062604GER
#ifdef UNDER_CE
#error Windows CE does not support environment variables.
#endif
// Boost.Runtime.Parameter
#include <boost/test/utils/runtime/config.hpp>
#include <boost/test/utils/runtime/fwd.hpp>
#include <boost/test/utils/runtime/parameter.hpp>
#include <boost/test/utils/runtime/argument.hpp>
#include <boost/test/utils/runtime/env/fwd.hpp>
// Boost
#include <boost/optional.hpp>
namespace boost {
namespace BOOST_RT_PARAM_NAMESPACE {
namespace environment {
// ************************************************************************** //
// ************** runtime::environment::variable_data ************** //
// ************************************************************************** //
namespace rt_env_detail {
struct variable_data : public runtime::parameter {
cstring m_var_name;
dstring m_global_id;
argument_ptr m_value;
};
} // namespace rt_env_detail
// ************************************************************************** //
// ************** runtime::environment::variable_base ************** //
// ************************************************************************** //
class variable_base {
public:
explicit variable_base( rt_env_detail::variable_data& data ) : m_data( &data ) {}
// arguments access
template<typename T>
T const& value() const
{
return arg_value<T>( *m_data->m_value );
}
template<typename T>
void value( boost::optional<T>& res ) const
{
if( has_value() )
res = arg_value<T>( *m_data->m_value );
else
res.reset();
}
bool has_value() const { return m_data->m_value!=0; }
cstring name() const { return m_data->m_var_name; }
protected:
// Data members
rt_env_detail::variable_data* m_data;
} ;
// ************************************************************************** //
// ************** runtime::environment::variable ************** //
// ************************************************************************** //
template<typename T = cstring>
class variable : public variable_base {
public:
// Constructors
explicit variable( cstring var_name );
template<typename Modifiers>
explicit variable( cstring var_name, Modifiers const& m );
explicit variable( rt_env_detail::variable_data& data )
: variable_base( data ) {}
// other variable assignment
void operator=( variable const& v ) { m_data = v.m_data; }
// access methods
T const& value() const { return variable_base::value<T>(); }
#if BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3206)) || \
BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x0593))
template<typename T>
void value( boost::optional<T>& res ) const { variable_base::value( res ); }
#else
using variable_base::value;
#endif
// Value assignment
template<typename V>
void operator=( V const& v )
{
if( !has_value() )
m_data->m_value.reset( new typed_argument<T>( *m_data ) );
arg_value<T>( *m_data->m_value ) = v;
rt_env_detail::sys_write_var( m_data->m_var_name, format_stream().ref() << value() );
}
}; // class variable
//____________________________________________________________________________//
template<typename CharT, typename Tr,typename T>
inline std::basic_ostream<CharT,Tr>&
operator<<( std::basic_ostream<CharT,Tr>& os, variable<T> const& v )
{
os << v.name() << '=';
if( v.has_value() )
os << v.value();
return os;
}
//____________________________________________________________________________//
template<typename T, typename V>
inline bool
operator==( variable<T> ev, V const& v )
{
return ev.has_value() && ev.value() == v;
}
//____________________________________________________________________________//
template<typename T, typename V>
inline bool
operator==( V const& v, variable<T> ev )
{
return ev.has_value() && ev.value() == v;
}
//____________________________________________________________________________//
template<typename T, typename V>
inline bool
operator!=( variable<T> ev, V const& v )
{
return !ev.has_value() || ev.value() != v;
}
//____________________________________________________________________________//
template<typename T, typename V>
inline bool
operator!=( V const& v, variable<T> ev )
{
return !ev.has_value() || ev.value() != v;
}
//____________________________________________________________________________//
} // namespace environment
} // namespace BOOST_RT_PARAM_NAMESPACE
} // namespace boost
// ************************************************************************** //
// ************************************************************************** //
// Implementation
#include <boost/test/utils/runtime/env/environment.hpp>
// ************************************************************************** //
// ************** runtime::environment::variable ************** //
// ************************************************************************** //
namespace boost {
namespace BOOST_RT_PARAM_NAMESPACE {
namespace environment {
template<typename T>
variable<T>::variable( cstring var_name )
: variable_base( environment::var<T>( var_name ) )
{}
//____________________________________________________________________________//
template<typename T>
template<typename Modifiers>
variable<T>::variable( cstring var_name, Modifiers const& m )
: variable_base( environment::var<T>( var_name, m ) )
{}
//____________________________________________________________________________//
} // namespace environment
} // namespace BOOST_RT_PARAM_NAMESPACE
} // namespace boost
#endif // BOOST_RT_ENV_VARIABLE_HPP_062604GER
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