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/* MIT License
*
* Copyright (c) 2023 Tyge Løvset
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/*
#include <stdio.h>
#include <stc/algo/cspan.h>
using_cspan(Span3f, float, 3);
int demo1() {
float raw[3*4*5];
Span3f span = cspan_make(raw, 3, 4, 5);
*cspan_at(&span, 2, 3, 4) = 100;
printf("%f\n", *cspan_at(&span, 2, 3, 4));
}
using_cspan(Intspan, int, 1);
int demo2() {
int array[] = {1, 2, 3, 4, 5};
Intspan span = cspan_from(array);
c_FOREACH (i, Intspan, span)
printf(" %d", *i.ref);
puts("");
// use a temporary IntSpan object.
c_FORFILTER (i, Intspan, cspan_object(Intspan, {10, 20, 30, 23, 22, 21})
, c_FLT_SKIPWHILE(i, *i.ref < 25)
&& (*i.ref & 1) == 0 // even only
, c_FLT_TAKE(i, 2)) // break after 2
printf(" %d", *i.ref);
puts("");
}
*/
#ifndef STC_CSPAN_H_INCLUDED
#define STC_CSPAN_H_INCLUDED
#include "../ccommon.h"
#define using_cspan(Self, T, RANK) \
typedef T Self##_value, Self##_raw; \
typedef struct { Self##_value *data; uint32_t dim[RANK]; } Self; \
typedef struct { Self##_value *ref, *end; } Self##_iter; \
\
STC_INLINE Self##_iter Self##_begin(const Self* self) { \
Self##_iter it = {self->data, self->data + cspan_size(self)}; \
return it; \
} \
STC_INLINE Self##_iter Self##_end(const Self* self) { \
Self##_iter it = {NULL, self->data + cspan_size(self)}; \
return it; \
} \
STC_INLINE void Self##_next(Self##_iter* it) \
{ if (++it->ref == it->end) it->ref = NULL; } \
struct stc_nostruct
#define cspan_assert(self, rank) c_STATIC_ASSERT(cspan_rank(self) == rank)
#define cspan_object(S, ...) \
((S){.data = (S##_value[])__VA_ARGS__, \
.dim = {sizeof((S##_value[])__VA_ARGS__)/sizeof(S##_value)}})
#define cspan_make(data, ...) {data, {__VA_ARGS__}}
#define cspan_from(data) \
{data + c_STATIC_ASSERT(sizeof(data) != sizeof(void*)), {c_ARRAYLEN(data)}}
#define cspan_size(self) _cspan_size((self)->dim, cspan_rank(self))
#define cspan_rank(self) c_ARRAYLEN((self)->dim)
#define cspan_reshape(self, ...) \
memcpy((self)->dim, (uint32_t[]){__VA_ARGS__}, \
sizeof((self)->dim) + cspan_assert(self, c_NUMARGS(__VA_ARGS__)))
#define cspan_at(self, ...) \
((self)->data + c_PASTE(_cspan_i, c_NUMARGS(__VA_ARGS__))((self)->dim, __VA_ARGS__) \
+ cspan_assert(self, c_NUMARGS(__VA_ARGS__)))
#define cspan_4to3(self, x) \
{cspan_at(self, x, 0, 0, 0), {(self)->dim[1], (self)->dim[2], (self)->dim[3]}}
#define cspan_4to2(self, x, y) \
{cspan_at(self, x, y, 0, 0), {(self)->dim[2], (self)->dim[3]}}
#define cspan_4to1(self, x, y, z) \
{cspan_at(self, x, y, z, 0), {(self)->dim[3]}}
#define cspan_3to2(self, x) \
{cspan_at(self, x, 0, 0), {(self)->dim[1], (self)->dim[2]}}
#define cspan_3to1(self, x, y) \
{cspan_at(self, x, y, 0), {(self)->dim[2]}}
#define cspan_2to1(self, x) \
{cspan_at(self, x, 0), {(self)->dim[1]}}
STC_INLINE uint32_t _cspan_i1(const uint32_t dim[1], uint32_t x)
{ assert(x < dim[0]); return x; }
STC_INLINE uint32_t _cspan_i2(const uint32_t dim[2], uint32_t x, uint32_t y)
{ assert(x < dim[0] && y < dim[1]); return dim[1]*x + y; }
STC_INLINE uint32_t _cspan_i3(const uint32_t dim[3], uint32_t x, uint32_t y, uint32_t z) {
assert(x < dim[0] && y < dim[1] && z < dim[2]);
return dim[2]*(dim[1]*x + y) + z;
}
STC_INLINE uint32_t _cspan_i4(const uint32_t dim[4], uint32_t x, uint32_t y, uint32_t z, uint32_t w) {
assert(x < dim[0] && y < dim[1] && z < dim[3] && w < dim[3]);
return dim[3]*(dim[2]*(dim[1]*x + y) + z) + w;
}
STC_INLINE size_t _cspan_size(const uint32_t dim[], unsigned rank) {
size_t sz = dim[0];
while (rank --> 1) sz *= dim[rank];
return sz;
}
#endif
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