// Author: Vadim Zeitlin
// Modified by:
// Created: 03.07.2003
-// RCS-ID: $Id$
// Copyright: (c) 2003 Vadim Zeitlin <vadim@wxwidgets.org>
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#else
-#if !defined(__GNUC__) || wxCHECK_GCC_VERSION(2, 95)
-// namespace support was first implemented in gcc-2.95,
-// so avoid using it for older versions.
namespace wxPrivate
{
-#else
-#define wxPrivate
-#endif
// in the original implementation this was a member template function of
// ScopeGuardImplBase but gcc 2.8 which is still used for OS/2 doesn't
// support member templates and so we must make it global
void Use(const T& WXUNUSED(t))
{
}
-#if !defined(__GNUC__) || wxCHECK_GCC_VERSION(2, 95)
} // namespace wxPrivate
-#endif
#define wxPrivateOnScopeExit(n) wxPrivate::OnScopeExit(n)
#define wxPrivateUse(n) wxPrivate::Use(n)
wxScopeGuardImplBase& operator=(const wxScopeGuardImplBase&);
};
+// wxScopeGuard is just a reference, see the explanation in CUJ article
+typedef const wxScopeGuardImplBase& wxScopeGuard;
+
// ----------------------------------------------------------------------------
// wxScopeGuardImpl0: scope guard for actions without parameters
// ----------------------------------------------------------------------------
return wxScopeGuardImpl2<F, P1, P2>::MakeGuard(fun, p1, p2);
}
+// ----------------------------------------------------------------------------
+// wxScopeGuardImpl3: scope guard for actions with 3 parameters
+// ----------------------------------------------------------------------------
+
+template <class F, class P1, class P2, class P3>
+class wxScopeGuardImpl3 : public wxScopeGuardImplBase
+{
+public:
+ static wxScopeGuardImpl3<F, P1, P2, P3> MakeGuard(F fun, P1 p1, P2 p2, P3 p3)
+ {
+ return wxScopeGuardImpl3<F, P1, P2, P3>(fun, p1, p2, p3);
+ }
+
+ ~wxScopeGuardImpl3() { wxPrivateOnScopeExit(*this); }
+
+ void Execute() { m_fun(m_p1, m_p2, m_p3); }
+
+protected:
+ wxScopeGuardImpl3(F fun, P1 p1, P2 p2, P3 p3)
+ : m_fun(fun), m_p1(p1), m_p2(p2), m_p3(p3) { }
+
+ F m_fun;
+ const P1 m_p1;
+ const P2 m_p2;
+ const P3 m_p3;
+
+ wxScopeGuardImpl3& operator=(const wxScopeGuardImpl3&);
+};
+
+template <class F, class P1, class P2, class P3>
+inline wxScopeGuardImpl3<F, P1, P2, P3> wxMakeGuard(F fun, P1 p1, P2 p2, P3 p3)
+{
+ return wxScopeGuardImpl3<F, P1, P2, P3>::MakeGuard(fun, p1, p2, p3);
+}
+
// ============================================================================
// wxScopeGuards for object methods
// ============================================================================
MakeObjGuard(obj, memFun, p1, p2);
}
+template <class Obj, class MemFun, class P1, class P2, class P3>
+class wxObjScopeGuardImpl3 : public wxScopeGuardImplBase
+{
+public:
+ static wxObjScopeGuardImpl3<Obj, MemFun, P1, P2, P3>
+ MakeObjGuard(Obj& obj, MemFun memFun, P1 p1, P2 p2, P3 p3)
+ {
+ return wxObjScopeGuardImpl3<Obj, MemFun, P1, P2, P3>(obj, memFun, p1, p2, p3);
+ }
+
+ ~wxObjScopeGuardImpl3() { wxPrivateOnScopeExit(*this); }
+
+ void Execute() { (m_obj.*m_memfun)(m_p1, m_p2, m_p3); }
+
+protected:
+ wxObjScopeGuardImpl3(Obj& obj, MemFun memFun, P1 p1, P2 p2, P3 p3)
+ : m_obj(obj), m_memfun(memFun), m_p1(p1), m_p2(p2), m_p3(p3) { }
+
+ Obj& m_obj;
+ MemFun m_memfun;
+ const P1 m_p1;
+ const P2 m_p2;
+ const P3 m_p3;
+};
+
+template <class Obj, class MemFun, class P1, class P2, class P3>
+inline wxObjScopeGuardImpl3<Obj, MemFun, P1, P2, P3>
+wxMakeObjGuard(Obj& obj, MemFun memFun, P1 p1, P2 p2, P3 p3)
+{
+ return wxObjScopeGuardImpl3<Obj, MemFun, P1, P2, P3>::
+ MakeObjGuard(obj, memFun, p1, p2, p3);
+}
+
+// ----------------------------------------------------------------------------
+// wxVariableSetter: use the same technique as for wxScopeGuard to allow
+// setting a variable to some value on block exit
+// ----------------------------------------------------------------------------
+
+namespace wxPrivate
+{
+
+// empty class just to be able to define a reference to it
+class VariableSetterBase : public wxScopeGuardImplBase { };
+
+typedef const VariableSetterBase& VariableSetter;
+
+template <typename T, typename U>
+class VariableSetterImpl : public VariableSetterBase
+{
+public:
+ VariableSetterImpl(T& var, U value)
+ : m_var(var),
+ m_value(value)
+ {
+ }
+
+ ~VariableSetterImpl() { wxPrivateOnScopeExit(*this); }
+
+ void Execute() { m_var = m_value; }
+
+private:
+ T& m_var;
+ const U m_value;
+
+ // suppress the warning about assignment operator not being generated
+ VariableSetterImpl<T, U>& operator=(const VariableSetterImpl<T, U>&);
+};
+
+template <typename T>
+class VariableNullerImpl : public VariableSetterBase
+{
+public:
+ VariableNullerImpl(T& var)
+ : m_var(var)
+ {
+ }
+
+ ~VariableNullerImpl() { wxPrivateOnScopeExit(*this); }
+
+ void Execute() { m_var = NULL; }
+
+private:
+ T& m_var;
+
+ VariableNullerImpl<T>& operator=(const VariableNullerImpl<T>&);
+};
+
+} // namespace wxPrivate
+
+template <typename T, typename U>
+inline
+wxPrivate::VariableSetterImpl<T, U> wxMakeVarSetter(T& var, U value)
+{
+ return wxPrivate::VariableSetterImpl<T, U>(var, value);
+}
+
+// calling wxMakeVarSetter(ptr, NULL) doesn't work because U is deduced to be
+// "int" and subsequent assignment of "U" to "T *" fails, so provide a special
+// function for this special case
+template <typename T>
+inline
+wxPrivate::VariableNullerImpl<T> wxMakeVarNuller(T& var)
+{
+ return wxPrivate::VariableNullerImpl<T>(var);
+}
+
// ============================================================================
-// public stuff
+// macros for declaring unnamed scoped guards (which can't be dismissed)
// ============================================================================
-// wxScopeGuard is just a reference, see the explanation in CUJ article
-typedef const wxScopeGuardImplBase& wxScopeGuard;
-
-// when an unnamed scope guard is needed, the macros below may be used
-//
// NB: the original code has a single (and much nicer) ON_BLOCK_EXIT macro
// but this results in compiler warnings about unused variables and I
// didn't find a way to work around this other than by having different
-// macros with different names
+// macros with different names or using a less natural syntax for passing
+// the arguments (e.g. as Boost preprocessor sequences, which would mean
+// having to write wxON_BLOCK_EXIT(fwrite, (buf)(size)(n)(fp)) instead of
+// wxON_BLOCK_EXIT4(fwrite, buf, size, n, fp)).
-#define wxGuardName wxMAKE_UNIQUE_NAME(scopeGuard)
+#define wxGuardName wxMAKE_UNIQUE_NAME(wxScopeGuard)
#define wxON_BLOCK_EXIT0_IMPL(n, f) \
wxScopeGuard n = wxMakeGuard(f); \
#define wxON_BLOCK_EXIT_THIS2(m, p1, p2) \
wxON_BLOCK_EXIT_OBJ2(*this, m, p1, p2)
+
+#define wxON_BLOCK_EXIT3_IMPL(n, f, p1, p2, p3) \
+ wxScopeGuard n = wxMakeGuard(f, p1, p2, p3); \
+ wxPrivateUse(n)
+#define wxON_BLOCK_EXIT3(f, p1, p2, p3) \
+ wxON_BLOCK_EXIT3_IMPL(wxGuardName, f, p1, p2, p3)
+
+#define wxON_BLOCK_EXIT_OBJ3_IMPL(n, o, m, p1, p2, p3) \
+ wxScopeGuard n = wxMakeObjGuard(o, m, p1, p2, p3); \
+ wxPrivateUse(n)
+#define wxON_BLOCK_EXIT_OBJ3(o, m, p1, p2, p3) \
+ wxON_BLOCK_EXIT_OBJ3_IMPL(wxGuardName, o, &m, p1, p2, p3)
+
+#define wxON_BLOCK_EXIT_THIS3(m, p1, p2, p3) \
+ wxON_BLOCK_EXIT_OBJ3(*this, m, p1, p2, p3)
+
+
+#define wxSetterName wxMAKE_UNIQUE_NAME(wxVarSetter)
+
+#define wxON_BLOCK_EXIT_SET_IMPL(n, var, value) \
+ wxPrivate::VariableSetter n = wxMakeVarSetter(var, value); \
+ wxPrivateUse(n)
+
+#define wxON_BLOCK_EXIT_SET(var, value) \
+ wxON_BLOCK_EXIT_SET_IMPL(wxSetterName, var, value)
+
+#define wxON_BLOCK_EXIT_NULL_IMPL(n, var) \
+ wxPrivate::VariableSetter n = wxMakeVarNuller(var); \
+ wxPrivateUse(n)
+
+#define wxON_BLOCK_EXIT_NULL(ptr) \
+ wxON_BLOCK_EXIT_NULL_IMPL(wxSetterName, ptr)
+
#endif // _WX_SCOPEGUARD_H_
projects / wxWidgets.git / blobdiff