Initial work for G-code sender and more intensive usage of Boost

xs/include/boost/test/utils/runtime/env/variable.hpp

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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: 81913 $
+//
+//  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