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// This code is in the public domain -- Ignacio Castaño <castano@gmail.com>
#pragma once
#ifndef NV_CORE_FOREACH_H
#define NV_CORE_FOREACH_H
/*
These foreach macros are very non-standard and somewhat confusing, but I like them.
*/
#include "nvcore.h"
#if NV_CC_CPP11
#define NV_FOREACH(i, container) \
for (auto i = (container).start(); !(container).isDone(i); (container).advance(i))
#elif NV_CC_GNUC // If typeof is available:
/*
Ideally we would like to write this:
#define NV_FOREACH(i, container) \
for(decltype(container)::PseudoIndex i((container).start()); !(container).isDone(i); (container).advance(i))
But gcc versions prior to 4.7 required an intermediate type. See:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=6709
*/
#define NV_FOREACH(i, container) \
typedef typeof(container) NV_STRING_JOIN2(cont,__LINE__); \
for(NV_STRING_JOIN2(cont,__LINE__)::PseudoIndex i((container).start()); !(container).isDone(i); (container).advance(i))
#else // If typeof not available:
#define NV_NEED_PSEUDOINDEX_WRAPPER 1
#include <new> // placement new
struct PseudoIndexWrapper {
template <typename T>
PseudoIndexWrapper(const T & container) {
nvStaticCheck(sizeof(typename T::PseudoIndex) <= sizeof(memory));
new (memory) typename T::PseudoIndex(container.start());
}
// PseudoIndex cannot have a dtor!
template <typename T> typename T::PseudoIndex & operator()(const T * /*container*/) {
return *reinterpret_cast<typename T::PseudoIndex *>(memory);
}
template <typename T> const typename T::PseudoIndex & operator()(const T * /*container*/) const {
return *reinterpret_cast<const typename T::PseudoIndex *>(memory);
}
uint8 memory[4]; // Increase the size if we have bigger enumerators.
};
#define NV_FOREACH(i, container) \
for(PseudoIndexWrapper i(container); !(container).isDone(i(&(container))); (container).advance(i(&(container))))
#endif
// Declare foreach keyword.
#if !defined NV_NO_USE_KEYWORDS
# define foreach NV_FOREACH
# define foreach_index NV_FOREACH
#endif
#endif // NV_CORE_FOREACH_H
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