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

xs/include/boost/test/utils/runtime/env/environment.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: 54633 $
+//
+//  Description : defines and implements inline model of program environment 
+// ***************************************************************************
+
+#ifndef BOOST_RT_ENV_ENVIRONMENT_HPP_062604GER
+#define BOOST_RT_ENV_ENVIRONMENT_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/argument.hpp>
+#include <boost/test/utils/runtime/interpret_argument_value.hpp>
+
+#include <boost/test/utils/runtime/env/fwd.hpp>
+#include <boost/test/utils/runtime/env/modifier.hpp>
+#include <boost/test/utils/runtime/env/variable.hpp>
+
+// Boost.Test
+#include <boost/test/utils/callback.hpp>
+
+// Boost
+#include <boost/optional.hpp>
+
+namespace boost {
+
+namespace BOOST_RT_PARAM_NAMESPACE {
+
+// ************************************************************************** //
+// **************      runtime::environment implementation     ************** //
+// ************************************************************************** //
+
+namespace environment {
+
+namespace rt_env_detail {
+
+template<typename T, typename Modifiers>
+variable_data&
+init_new_var( cstring var_name, Modifiers m = nfp::no_params )
+{
+    rt_env_detail::variable_data& new_vd = new_var_record( var_name );
+
+    cstring str_value = sys_read_var( new_vd.m_var_name );
+
+    if( !str_value.is_empty() ) {
+        try {
+            boost::optional<T> value;
+
+            if( m.has( interpreter ) )
+                m[interpreter]( str_value, value );
+            else
+                interpret_argument_value( str_value, value, 0 );
+
+            if( !!value ) {
+                new_vd.m_value.reset( new typed_argument<T>( new_vd ) );
+
+                arg_value<T>( *new_vd.m_value ) = *value;
+            }
+        }
+        catch( ... ) { // !! could we do that
+            // !! should we report an error?
+        }
+    }
+
+    if( !new_vd.m_value && m.has( default_value ) ) {
+        new_vd.m_value.reset( new typed_argument<T>( new_vd ) );
+
+        nfp::optionally_assign( arg_value<T>( *new_vd.m_value ), m[default_value] );
+    }
+
+    nfp::optionally_assign( new_vd.m_global_id, m, global_id );
+
+    return new_vd;
+}
+
+//____________________________________________________________________________//
+
+} // namespace rt_env_detail
+
+} // namespace environment
+
+// ************************************************************************** //
+// **************             runtime::environment             ************** //
+// ************************************************************************** //
+
+namespace environment {
+
+    // variable access
+    variable_base
+    var( cstring var_name );
+
+    //________________________________________________________________________//
+
+    template<typename T>
+    inline variable<T>
+    var( cstring var_name )
+    {
+        rt_env_detail::variable_data* vd = rt_env_detail::find_var_record( var_name );
+
+        return environment::variable<T>( !vd ? rt_env_detail::init_new_var<T>( var_name, nfp::no_params ) : *vd );
+    }
+
+    //________________________________________________________________________//
+
+    template<typename T, typename Modifiers>
+    inline variable<T>
+    var( cstring var_name, Modifiers const& m )
+    {
+        rt_env_detail::variable_data* vd = rt_env_detail::find_var_record( var_name );
+
+        return environment::variable<T>( !vd ? rt_env_detail::init_new_var<T>( var_name, m ) : *vd );
+    }
+
+    //________________________________________________________________________//
+
+    // direct variable value access
+    inline cstring
+    get( cstring var_name )
+    {
+        return environment::var<cstring>( var_name ).value();
+    }
+
+    //________________________________________________________________________//
+
+    template<typename T>
+    inline T const&
+    get( cstring var_name )
+    {
+        return environment::var<T>( var_name ).value();
+    }
+
+    //________________________________________________________________________//
+
+    template<typename T>
+    inline void
+    get( cstring var_name, boost::optional<T>& res )
+    {
+        variable<T> const& v = environment::var<T>( var_name );
+        v.value( res );
+    }
+
+    //________________________________________________________________________//
+
+} // namespace environment
+
+namespace env = environment;
+
+} // namespace BOOST_RT_PARAM_NAMESPACE
+
+} // namespace boost
+
+#ifndef BOOST_RT_PARAM_OFFLINE
+
+#define BOOST_RT_PARAM_INLINE inline
+#include <boost/test/utils/runtime/env/environment.ipp>
+
+#endif
+
+#endif // BOOST_RT_ENV_ENVIRONMENT_HPP_062604GER