X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/d775fa82354a1f8d5db87ad1d71ab00ef7d9123c..43cf637fac1894db167f0ed34d1958107a48ea85:/include/wx/scopeguard.h diff --git a/include/wx/scopeguard.h b/include/wx/scopeguard.h index c46f443569..f1f5a8204c 100644 --- a/include/wx/scopeguard.h +++ b/include/wx/scopeguard.h @@ -11,8 +11,9 @@ /* Acknowledgements: this header is heavily based on (well, almost the exact - copy of) wxScopeGuard.h by Andrei Alexandrescu and Petru Marginean published + copy of) ScopeGuard.h by Andrei Alexandrescu and Petru Marginean published in December 2000 issue of C/C++ Users Journal. + http://www.cuj.com/documents/cujcexp1812alexandr/ */ #ifndef _WX_SCOPEGUARD_H_ @@ -26,12 +27,42 @@ // helpers // ---------------------------------------------------------------------------- +#ifdef __WATCOMC__ + +// WATCOM-FIXME: C++ of Open Watcom 1.3 doesn't like OnScopeExit() created +// through template so it must be workarounded with dedicated inlined macro. +// For compatibility with Watcom compilers wxPrivate::OnScopeExit must be +// replaced with wxPrivateOnScopeExit but in user code (for everyone who +// doesn't care about OW compatibility) wxPrivate::OnScopeExit still works. + +#define wxPrivateOnScopeExit(guard) \ + { \ + if ( !(guard).WasDismissed() ) \ + { \ + wxTRY \ + { \ + (guard).Execute(); \ + } \ + wxCATCH_ALL(;) \ + } \ + } + +#define wxPrivateUse(n) wxUnusedVar(n) + +#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 - template + template void OnScopeExit(ScopeGuardImpl& guard) { if ( !guard.WasDismissed() ) @@ -46,11 +77,18 @@ namespace wxPrivate } // just to avoid the warning about unused variables - template + template 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) + +#endif // ============================================================================ // wxScopeGuard for functions and functors @@ -65,20 +103,20 @@ class wxScopeGuardImplBase public: wxScopeGuardImplBase() : m_wasDismissed(false) { } + wxScopeGuardImplBase(const wxScopeGuardImplBase& other) + : m_wasDismissed(other.m_wasDismissed) + { + other.Dismiss(); + } + void Dismiss() const { m_wasDismissed = true; } - // for OnScopeExit() only we can't make it friend, unfortunately)! + // for OnScopeExit() only (we can't make it friend, unfortunately)! bool WasDismissed() const { return m_wasDismissed; } protected: ~wxScopeGuardImplBase() { } - wxScopeGuardImplBase(const wxScopeGuardImplBase& other) - : m_wasDismissed(other.m_wasDismissed) - { - other.Dismiss(); - } - // must be mutable for copy ctor to work mutable bool m_wasDismissed; @@ -90,7 +128,7 @@ private: // wxScopeGuardImpl0: scope guard for actions without parameters // ---------------------------------------------------------------------------- -template +template class wxScopeGuardImpl0 : public wxScopeGuardImplBase { public: @@ -99,7 +137,7 @@ public: return wxScopeGuardImpl0(fun); } - ~wxScopeGuardImpl0() { wxPrivate::OnScopeExit(*this); } + ~wxScopeGuardImpl0() { wxPrivateOnScopeExit(*this); } void Execute() { m_fun(); } @@ -111,7 +149,7 @@ protected: wxScopeGuardImpl0& operator=(const wxScopeGuardImpl0&); }; -template +template inline wxScopeGuardImpl0 wxMakeGuard(F fun) { return wxScopeGuardImpl0::MakeGuard(fun); @@ -121,7 +159,7 @@ inline wxScopeGuardImpl0 wxMakeGuard(F fun) // wxScopeGuardImpl1: scope guard for actions with 1 parameter // ---------------------------------------------------------------------------- -template +template class wxScopeGuardImpl1 : public wxScopeGuardImplBase { public: @@ -130,7 +168,7 @@ public: return wxScopeGuardImpl1(fun, p1); } - ~wxScopeGuardImpl1() { wxPrivate::OnScopeExit(*this); } + ~wxScopeGuardImpl1() { wxPrivateOnScopeExit(* this); } void Execute() { m_fun(m_p1); } @@ -143,7 +181,7 @@ protected: wxScopeGuardImpl1& operator=(const wxScopeGuardImpl1&); }; -template +template inline wxScopeGuardImpl1 wxMakeGuard(F fun, P1 p1) { return wxScopeGuardImpl1::MakeGuard(fun, p1); @@ -153,7 +191,7 @@ inline wxScopeGuardImpl1 wxMakeGuard(F fun, P1 p1) // wxScopeGuardImpl2: scope guard for actions with 2 parameters // ---------------------------------------------------------------------------- -template +template class wxScopeGuardImpl2 : public wxScopeGuardImplBase { public: @@ -162,7 +200,7 @@ public: return wxScopeGuardImpl2(fun, p1, p2); } - ~wxScopeGuardImpl2() { wxPrivate::OnScopeExit(*this); } + ~wxScopeGuardImpl2() { wxPrivateOnScopeExit(*this); } void Execute() { m_fun(m_p1, m_p2); } @@ -176,7 +214,7 @@ protected: wxScopeGuardImpl2& operator=(const wxScopeGuardImpl2&); }; -template +template inline wxScopeGuardImpl2 wxMakeGuard(F fun, P1 p1, P2 p2) { return wxScopeGuardImpl2::MakeGuard(fun, p1, p2); @@ -190,7 +228,7 @@ inline wxScopeGuardImpl2 wxMakeGuard(F fun, P1 p1, P2 p2) // wxObjScopeGuardImpl0 // ---------------------------------------------------------------------------- -template +template class wxObjScopeGuardImpl0 : public wxScopeGuardImplBase { public: @@ -200,7 +238,7 @@ public: return wxObjScopeGuardImpl0(obj, memFun); } - ~wxObjScopeGuardImpl0() { wxPrivate::OnScopeExit(*this); } + ~wxObjScopeGuardImpl0() { wxPrivateOnScopeExit(*this); } void Execute() { (m_obj.*m_memfun)(); } @@ -212,13 +250,13 @@ protected: MemFun m_memfun; }; -template +template inline wxObjScopeGuardImpl0 wxMakeObjGuard(Obj& obj, MemFun memFun) { return wxObjScopeGuardImpl0::MakeObjGuard(obj, memFun); } -template +template class wxObjScopeGuardImpl1 : public wxScopeGuardImplBase { public: @@ -228,7 +266,7 @@ public: return wxObjScopeGuardImpl1(obj, memFun, p1); } - ~wxObjScopeGuardImpl1() { wxPrivate::OnScopeExit(*this); } + ~wxObjScopeGuardImpl1() { wxPrivateOnScopeExit(*this); } void Execute() { (m_obj.*m_memfun)(m_p1); } @@ -241,14 +279,14 @@ protected: const P1 m_p1; }; -template +template inline wxObjScopeGuardImpl1 wxMakeObjGuard(Obj& obj, MemFun memFun, P1 p1) { return wxObjScopeGuardImpl1::MakeObjGuard(obj, memFun, p1); } -template +template class wxObjScopeGuardImpl2 : public wxScopeGuardImplBase { public: @@ -258,7 +296,7 @@ public: return wxObjScopeGuardImpl2(obj, memFun, p1, p2); } - ~wxObjScopeGuardImpl2() { wxPrivate::OnScopeExit(*this); } + ~wxObjScopeGuardImpl2() { wxPrivateOnScopeExit(*this); } void Execute() { (m_obj.*m_memfun)(m_p1, m_p2); } @@ -272,7 +310,7 @@ protected: const P2 m_p2; }; -template +template inline wxObjScopeGuardImpl2 wxMakeObjGuard(Obj& obj, MemFun memFun, P1 p1, P2 p2) { @@ -293,29 +331,43 @@ typedef const wxScopeGuardImplBase& wxScopeGuard; // 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 + +#define wxGuardName wxMAKE_UNIQUE_NAME(scopeGuard) + +#define wxON_BLOCK_EXIT0_IMPL(n, f) \ + wxScopeGuard n = wxMakeGuard(f); \ + wxPrivateUse(n) #define wxON_BLOCK_EXIT0(f) \ - wxScopeGuard wxMAKE_UNIQUE_NAME(scopeGuard) = wxMakeGuard(f); \ - wxPrivate::Use(wxMAKE_UNIQUE_NAME(scopeGuard)) + wxON_BLOCK_EXIT0_IMPL(wxGuardName, f) +#define wxON_BLOCK_EXIT_OBJ0_IMPL(n, o, m) \ + wxScopeGuard n = wxMakeObjGuard(o, m); \ + wxPrivateUse(n) #define wxON_BLOCK_EXIT_OBJ0(o, m) \ - wxScopeGuard wxMAKE_UNIQUE_NAME(scopeGuard) = wxMakeObjGuard(o, m); \ - wxPrivate::Use(wxMAKE_UNIQUE_NAME(scopeGuard)) + wxON_BLOCK_EXIT_OBJ0_IMPL(wxGuardName, o, &m) +#define wxON_BLOCK_EXIT1_IMPL(n, f, p1) \ + wxScopeGuard n = wxMakeGuard(f, p1); \ + wxPrivateUse(n) #define wxON_BLOCK_EXIT1(f, p1) \ - wxScopeGuard wxMAKE_UNIQUE_NAME(scopeGuard) = wxMakeGuard(f, p1); \ - wxPrivate::Use(wxMAKE_UNIQUE_NAME(scopeGuard)) + wxON_BLOCK_EXIT1_IMPL(wxGuardName, f, p1) +#define wxON_BLOCK_EXIT_OBJ1_IMPL(n, o, m, p1) \ + wxScopeGuard n = wxMakeObjGuard(o, m, p1); \ + wxPrivateUse(n) #define wxON_BLOCK_EXIT_OBJ1(o, m, p1) \ - wxScopeGuard wxMAKE_UNIQUE_NAME(scopeGuard) = wxMakeObjGuard(o, m, p1); \ - wxPrivate::Use(wxMAKE_UNIQUE_NAME(scopeGuard)) + wxON_BLOCK_EXIT_OBJ1_IMPL(wxGuardName, o, &m, p1) +#define wxON_BLOCK_EXIT2_IMPL(n, f, p1, p2) \ + wxScopeGuard n = wxMakeGuard(f, p1, p2); \ + wxPrivateUse(n) #define wxON_BLOCK_EXIT2(f, p1, p2) \ - wxScopeGuard wxMAKE_UNIQUE_NAME(scopeGuard) = wxMakeGuard(f, p1, p2); \ - wxPrivate::Use(wxMAKE_UNIQUE_NAME(scopeGuard)) + wxON_BLOCK_EXIT2_IMPL(wxGuardName, f, p1, p2) +#define wxON_BLOCK_EXIT_OBJ2_IMPL(n, o, m, p1, p2) \ + wxScopeGuard n = wxMakeObjGuard(o, m, p1, p2); \ + wxPrivateUse(n) #define wxON_BLOCK_EXIT_OBJ2(o, m, p1, p2) \ - wxScopeGuard wxMAKE_UNIQUE_NAME(scopeGuard) = wxMakeObjGuard(o, m, p1, p2); \ - wxPrivate::Use(wxMAKE_UNIQUE_NAME(scopeGuard)) + wxON_BLOCK_EXIT_OBJ2_IMPL(wxGuardName, o, &m, p1, p2) #endif // _WX_SCOPEGUARD_H_ -