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xo-arena: annex cmpresult.*pp from xo-alloc2

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Roland Conybeare 2026-01-06 00:30:40 -05:00
commit 5f882ca19d
3 changed files with 1 additions and 126 deletions
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87
include/xo/alloc2/cmpresult.hpp
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@ -1,87 +0,0 @@
/** @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,
};
extern const char * comparison2str(comparison x);
inline std::ostream &
operator<<(std::ostream & os, comparison x) {
os << comparison2str(x);
return os;
}
/** Result of a generic comparison operation
**/
struct cmpresult {
/** @defgroup mm-cmpresult-ctors cmpresult ctors **/
///@{
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();
}
///@}
/** @defgroup mm-cmpresult-methods cmpresult methods **/
///@{
/** print to stream **/
void display(std::ostream & os) const;
bool is_lesser() const {
return (err_ == comparison::comparable) && (cmp_ < 0);
}
bool is_equal() const {
return (err_ == comparison::comparable) && (cmp_ == 0);
}
///@}
/** @defgroup mm-cmpresult-instance-vars cmpresult instance vars **/
///@{
/** -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)
{
x.display(os);
return os;
}
} /*namespace mm*/
} /*namespace xo*/
/* end cmpresult.hpp */