lyx_mirror/sigc++/marshal.h
Lars Gullik Bjønnes 6d678c927c more FILMagain stuff
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@808 a592a061-630c-0410-9148-cb99ea01b6c8
2000-06-12 11:55:12 +00:00

210 lines
4.0 KiB
C++

#ifndef SIGCXX_MARSHALLER_H
#define SIGCXX_MARSHALLER_H
#include <sigc++/sigc++config.h>
#ifndef SIGC_CXX_PARTIAL_SPEC
#include <sigc++/slot.h>
#endif
#ifndef SIGC_CXX_INT_CTOR
#include <new>
#endif
#ifdef SIGC_PTHREADS
#include <sigc++/thread.h>
#endif
#ifdef SIGC_CXX_NAMESPACES
namespace SigC
{
#endif
/*
All classes used to marshal return values should have the following
class SomeMarshal
{
// both typedefs must be defined.
typedef Type1 InType;
typedef Type2 OutType;
public:
// Return final return code.
OutType value();
// Captures return codes and returns TRUE to stop emittion.
bool marshal(const InType&);
SomeMarshal();
};
It is not necessary for the InType to match the OutType.
This is to allow for things like list capturing.
*/
/*******************************************************************
***** Marshal
*******************************************************************/
// A struct that holds an flag for determining
// if the return value is to be ignored.
class LIBSIGC_API RetCode
{
public:
static int check_ignore();
static void ignore();
};
// Basic Marshal class.
template <typename R>
class Marshal
{
public:
typedef R OutType;
#ifdef SIGC_CXX_PARTIAL_SPEC
typedef R InType;
protected:
typedef OutType OutType_;
#else
typedef Trait<R>::type InType;
protected:
typedef InType OutType_;
#endif
OutType_ value_;
public:
OutType_& value() {return value_;}
static OutType_ default_value()
#ifdef SIGC_CXX_INT_CTOR
{return OutType_();}
#else
{OutType_ r; new (&r) OutType_(); return r;}
#endif
// This captures return values. Return TRUE to stop emittion process.
bool marshal(const InType& newval)
{
if (!RetCode::check_ignore()) value_=newval;
return 0; // continue emittion process
};
Marshal()
#ifdef SIGC_CXX_INT_CTOR
:value_()
{RetCode::check_ignore();}
#else
{
RetCode::check_ignore();
new (&value_) OutType_();
}
#endif
};
#ifdef SIGC_CXX_SPECIALIZE_REFERENCES
// Basic Marshal class.
template <typename R>
class Marshal<R&>
{
public:
typedef R& OutType;
typedef R& InType;
R* value_;
OutType value() {return value_;}
static OutType default_value() {return Default;}
static R Default;
// This captures return values. Return TRUE to stop emittion process.
bool marshal(InType newval)
{
if (!RetCode::check_ignore()) value_=&newval;
return 0; // continue emittion process
};
Marshal()
:value_(&Default)
{RetCode::check_ignore();}
~Marshal()
{}
};
template <typename T> T Marshal<T&>::Default;
#endif
#ifdef SIGC_CXX_PARTIAL_SPEC
// dummy marshaller for void type.
template <>
class Marshal<void>
{
public:
Marshal()
{}
~Marshal()
{}
};
#endif
// starts with a fixed value
template <class R,R initial>
class FixedMarshal
{
public:
typedef R OutType;
typedef R InType;
R value_;
OutType& value() {return value_;}
static OutType default_value() { return initial; }
bool marshal(const InType& newval)
{
if (!RetCode::check_ignore()) value_=newval;
return 0; // continue emittion process
};
FixedMarshal()
:value_(initial)
{RetCode::check_ignore();}
~FixedMarshal()
{}
};
template <class R>
struct FastMarshal
{
typedef R OutType;
typedef R InType;
R value_;
OutType& value() {return value_;}
static OutType default_value()
#ifdef SIGC_CXX_INT_CTOR
{return R();}
#else
{R r; new (&r) R(); return r;}
#endif
bool marshal(const InType& newval)
{
value_=newval;
return 0; // continue emittion process
};
FastMarshal()
#ifdef SIGC_CXX_INT_CTOR
:value_()
{}
#else
{new (&value_) R();}
#endif
~FastMarshal()
{}
};
#ifdef SIGC_CXX_NAMESPACES
} // namespace sigc
#endif
#endif