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#pragma once
#include <array>
#include <cassert>
#include <cstdint>
#include "tome/pp/global_constexpr.hpp"
/**
* Set of binary flags.
*/
template<std::size_t Tiers> struct flag_set
{
private:
static constexpr std::size_t tiers = Tiers;
std::uint32_t m_data[tiers];
public:
static constexpr const std::size_t nbits = tiers * 32;
public:
constexpr flag_set()
: m_data { 0 }
{
// It is *extremely* important that there are absolutely
// NO dependencies on any global objects in here; lest we
// fall into SIOF territory; see DECLARE_FLAG_ZERO_IMPL
}
// This method is a workaround for a a segmentation fault
// when compiling with GCC 5.3.0 (Arch Linux). We should be
// able to use make() directly in DECLARE_FLAG_MAKE_INIT,
// but GCC segfaults.
template<std::uint32_t tier, std::size_t index> static constexpr flag_set make_static()
{
static_assert(tier < tiers, "tier >= tiers");
static_assert(index < 32, "index >= 32");
flag_set f;
f.m_data[tier] = (1UL << index);
return f;
}
static constexpr flag_set make(std::uint32_t tier, std::size_t index)
{
assert(tier < tiers);
assert(index < 32);
flag_set f;
f.m_data[tier] = (1UL << index);
return f;
}
static constexpr flag_set make_bit(std::size_t ibit)
{
assert(ibit < nbits);
flag_set f;
f.m_data[ibit / 32] = (1UL << (ibit % 32));
return f;
}
constexpr std::size_t size() const
{
return tiers;
}
constexpr bool empty() const
{
for (std::size_t i = 0; i < tiers; i++)
{
if (m_data[i])
{
return false;
}
}
return true;
}
constexpr std::size_t count() const
{
std::size_t n = 0;
for (std::size_t i = 0; i < nbits; i++)
{
if (bit(i))
{
n += 1;
}
}
return n;
}
uint32_t &operator[](std::size_t i)
{
assert(i < tiers);
return m_data[i];
}
constexpr uint32_t const &operator [](std::size_t i) const
{
assert(i < tiers);
return m_data[i];
}
explicit constexpr operator bool() const
{
return !empty();
}
constexpr bool operator == (flag_set const &other) const
{
for (std::size_t i = 0; i < tiers; i++)
{
if (m_data[i] != other.m_data[i])
{
return false;
}
}
return true;
}
constexpr bool operator != (flag_set const &other) const
{
return !(*this == other);
}
constexpr bool bit(std::size_t i) const
{
assert(i < nbits);
return (m_data[i / 32] & (1UL << (i % 32)));
}
flag_set &operator |= (flag_set const &other)
{
for (std::size_t i = 0; i < tiers; i++)
{
m_data[i] |= other.m_data[i];
}
return *this;
}
constexpr flag_set operator | (flag_set const &other) const
{
flag_set f;
for (std::size_t i = 0; i < tiers; i++)
{
f.m_data[i] = m_data[i] | other.m_data[i];
}
return f;
}
flag_set &operator &= (flag_set const &other)
{
for (std::size_t i = 0; i < tiers; i++)
{
m_data[i] &= other.m_data[i];
}
return *this;
}
constexpr flag_set operator & (flag_set const &other) const
{
flag_set f;
for (std::size_t i = 0; i < tiers; i++)
{
f.m_data[i] = m_data[i] & other.m_data[i];
}
return f;
}
constexpr flag_set operator ~ () const
{
flag_set f;
for (std::size_t i = 0; i < tiers; i++)
{
f.m_data[i] = ~m_data[i];
}
return f;
}
};
// Implementation details, because preprocessor.
#define DECLARE_FLAG_MAKE_INIT(type, tier, index) \
type::make_static<tier-1,index>()
/**
* Macro for declaring a "flag" constant.
*/
#define DECLARE_FLAG(type, name, tier, index) \
PP_GLOBAL_CONSTEXPR_CONST(type, name, DECLARE_FLAG_MAKE_INIT(type, tier, index))
/**
* Macro for declaring a zero'ed "flag" variable.
*/
#define DECLARE_FLAG_ZERO_INTF(type, name) \
extern type name
/**
* Macro for declaring the implementation of a zero'ed "flag" variable.
*/
#define DECLARE_FLAG_ZERO_IMPL(type, name) \
type name { };
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