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util/Cast: reimplement as template without macro

This commit is contained in:
Max Kellermann 2014-07-14 16:24:07 +02:00
parent f8da8b0261
commit 7a1f3177c9
3 changed files with 33 additions and 16 deletions
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14
src/output/plugins/httpd/HttpdInternal.hxx
View File

@ -152,19 +152,13 @@ public:
HttpdOutput(EventLoop &_loop);
~HttpdOutput();
#if GCC_CHECK_VERSION(4,6) || defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Winvalid-offsetof"
#if defined(__clang__) || GCC_CHECK_VERSION(4,7)
constexpr
#endif
static constexpr HttpdOutput *Cast(AudioOutput *ao) {
return ContainerCast(ao, HttpdOutput, base);
static HttpdOutput *Cast(AudioOutput *ao) {
return &ContainerCast(*ao, &HttpdOutput::base);
}
#if GCC_CHECK_VERSION(4,6) || defined(__clang__)
#pragma GCC diagnostic pop
#endif
using DeferredMonitor::GetEventLoop;
bool Init(const config_param &param, Error &error);

7
src/tag/TagPool.cxx
View File

@ -87,10 +87,13 @@ calc_hash(TagType type, const char *p)
return hash ^ type;
}
static inline constexpr TagPoolSlot *
#if defined(__clang__) || GCC_CHECK_VERSION(4,7)
constexpr
#endif
static inline TagPoolSlot *
tag_item_to_slot(TagItem *item)
{
return ContainerCast(item, TagPoolSlot, item);
return &ContainerCast(*item, &TagPoolSlot::item);
}
static inline TagPoolSlot **

28
src/util/Cast.hxx
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2013 Max Kellermann <max@duempel.org>
* Copyright (C) 2013-2014 Max Kellermann <max@duempel.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -64,11 +64,31 @@ OffsetCast(const U *p, ptrdiff_t offset)
return reinterpret_cast<const T *>(OffsetPointer(p, offset));
}
template<class C, class A>
static constexpr inline ptrdiff_t
ContainerAttributeOffset(const C *null_c, const A C::*p)
{
return ptrdiff_t((const char *)null_c - (const char *)&(null_c->*p));
}
template<class C, class A>
static constexpr inline ptrdiff_t
ContainerAttributeOffset(const A C::*p)
{
return ContainerAttributeOffset<C, A>(nullptr, p);
}
/**
* Cast the given pointer to a struct member to its parent structure.
*/
#define ContainerCast(p, container, attribute) \
OffsetCast<container, decltype(((container*)nullptr)->attribute)> \
((p), -ptrdiff_t(offsetof(container, attribute)))
template<class C, class A>
#if defined(__clang__) || GCC_CHECK_VERSION(4,7)
constexpr
#endif
static inline C &
ContainerCast(A &a, A C::*member)
{
return *OffsetCast<C, A>(&a, ContainerAttributeOffset<C, A>(member));
}
#endif