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author | 2015-11-08 12:56:12 +0100 | |
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committer | 2015-11-08 12:56:12 +0100 | |
commit | 7c19aac60e12d6f5ea301bdb34d7826a01e0b06f (patch) | |
tree | f310d86aa2c6bfc19d115307dedde4eb0cd52dad /src/lib/util/delegate.cpp | |
parent | a57b46ae933badd7441ce1644711dbb851e2b504 (diff) |
Rename *.c -> *.cpp in our source (nw)
Diffstat (limited to 'src/lib/util/delegate.cpp')
-rw-r--r-- | src/lib/util/delegate.cpp | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/lib/util/delegate.cpp b/src/lib/util/delegate.cpp new file mode 100644 index 00000000000..964b4f9c0ac --- /dev/null +++ b/src/lib/util/delegate.cpp @@ -0,0 +1,62 @@ +// license:BSD-3-Clause +// copyright-holders:Aaron Giles +/*************************************************************************** + + delegate.c + + Templates and classes to enable delegates for callbacks. + +***************************************************************************/ + +#include <assert.h> + +#include "osdcomm.h" +#include "delegate.h" + + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +#if (USE_DELEGATE_TYPE == DELEGATE_TYPE_COMPATIBLE) + +delegate_mfp::raw_mfp_data delegate_mfp::s_null_mfp = { {0 }}; + +#endif + + + +//************************************************************************** +// INTERNAL DELEGATE HELPERS +//************************************************************************** + +#if (USE_DELEGATE_TYPE == DELEGATE_TYPE_INTERNAL) + +/** + * @fn delegate_generic_function delegate_mfp::convert_to_generic(delegate_generic_class *&object) const + * + * @brief ------------------------------------------------- + * delegate_convert_raw - given an object and an raw function, adjust the object base + * and return the actual final code pointer + * -------------------------------------------------. + * + * @param [in,out] object [in,out] If non-null, the object. + * + * @return The given data converted to a generic. + */ + +delegate_generic_function delegate_mfp::convert_to_generic(delegate_generic_class *&object) const +{ + // apply the "this" delta to the object first + object = reinterpret_cast<delegate_generic_class *>(reinterpret_cast<UINT8 *>(object) + m_this_delta); + + // if the low bit of the vtable index is clear, then it is just a raw function pointer + if (!(m_function & 1)) + return reinterpret_cast<delegate_generic_function>(m_function); + + // otherwise, it is the byte index into the vtable where the actual function lives + UINT8 *vtable_base = *reinterpret_cast<UINT8 **>(object); + return *reinterpret_cast<delegate_generic_function *>(vtable_base + m_function - 1); +} + +#endif |