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xo-alloc2: DX1CollectorIterator infra [WIP]

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Roland Conybeare 2025-12-17 20:16:46 -05:00
commit bf27314688
30 changed files with 1041 additions and 176 deletions
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include/xo/alloc2/cmpresult.hpp Normal file
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/** @file cmpresult.hpp
*
* @author Roland Conybeare, Dec 2025
**/
#pragma once
#include <iostream>
#include <cstdint>
namespace xo {
namespace mm {
enum class comparison : int32_t {
invalid = -1,
comparable = 0,
incomparable = 1,
};
struct cmpresult {
cmpresult() : err_{comparison::invalid}, cmp_{0} {}
cmpresult(comparison err, std::int16_t cmp) : err_{err}, cmp_{cmp} {}
static cmpresult incomparable() { return cmpresult(comparison::incomparable, 0); }
static cmpresult lesser() { return cmpresult(comparison::comparable, -1); }
static cmpresult equal() { return cmpresult(comparison::comparable, 0); }
static cmpresult greater() { return cmpresult(comparison::comparable, +1); }
template<typename T>
static cmpresult from_cmp(T && x, T && y) {
if (x < y)
return cmpresult::lesser();
else if (x == y)
return cmpresult::equal();
else
return cmpresult::greater();
}
bool is_equal() const { return (err_ == comparison::comparable) && (cmp_ == 0); }
/* -1 -> invalid (sentinel)
* 0 -> comparable
* 1 -> incomparable (e.g. iterators from different arenas)
*/
comparison err_ = comparison::invalid;
/* <0 -> lesser; 0 -> equal, >0 -> greater */
std::int16_t cmp_ = 0;
};
inline std::ostream & operator<<(std::ostream & os,
const cmpresult & x)
{
os << "<cmpresult " << xtag("err", x.err_) << xtag("cmp", x.cmp_) << ">";
}
} /*namespace mm*/
} /*namespace xo*/
/* end cmpresult.hpp */