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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/cspan.h>
#include <stc/algo/filter.h>
using_cspan(Span2f, float, 2);
using_cspan(Intspan, int, 1);
int demo1() {
float raw[4*5];
Span2f ms = cspan_make(raw, 4, 5);
for (size_t i=0; i<ms.dim[0]; i++)
for (size_t j=0; j<ms.dim[1]; j++)
*cspan_at(&ms, i, j) = i*1000 + j;
printf("%f\n", *cspan_at(&ms, 3, 4));
}
int demo2() {
int array[] = {10, 20, 30, 23, 22, 21};
Intspan span = cspan_from_array(array);
c_FOREACH (i, Intspan, span)
printf(" %d", *i.ref);
puts("");
c_FORFILTER (i, Intspan, span,
, 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; typedef T Self##_raw; \
typedef struct { Self##_value *ref, *end; } Self##_iter; \
typedef struct { Self##_value *data; uint32_t dim[RANK]; } Self; \
\
STC_INLINE Self Self##_from_n(Self##_raw* raw, const size_t n) { \
return (Self){.data=raw, .dim={(uint32_t)n}}; \
} \
STC_INLINE Self##_iter Self##_begin(const Self* self) { \
size_t n = cspan_size(self); \
Self##_iter it = {n ? self->data : NULL, self->data + n}; \
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 using_cspan2(Self, T) using_cspan(Self, T, 1); using_cspan(Self##2, T, 2)
#define using_cspan3(Self, T) using_cspan2(Self, T); using_cspan(Self##3, T, 3)
#define using_cspan4(Self, T) using_cspan3(Self, T); using_cspan(Self##4, T, 4)
#define cspan_rank_ok(self, rank) c_static_assert(cspan_rank(self) == rank)
#define cspan_make(array, ...) \
{.data=array, .dim={__VA_ARGS__}}
/* For static initialization use , cspan_init(). c_make() only works for non-static. */
#define cspan_init(SpanType, ...) \
{.data=(SpanType##_value[])__VA_ARGS__, .dim={sizeof((SpanType##_value[])__VA_ARGS__)/sizeof(SpanType##_value)}}
/* create a cspan from a cvec, cstack, cdeq, cqueue, or cpque (heap) */
#define cspan_from(container) \
{.data=(container)->data, .dim={(uint32_t)(container)->_len}}
#define cspan_from_array(array) \
{.data=(array) + c_static_assert(sizeof(array) != sizeof(void*)), .dim={c_ARRAYLEN(array)}}
#define cspan_size(self) _cspan_size((self)->dim, cspan_rank(self))
#define cspan_rank(self) c_ARRAYLEN((self)->dim)
#define cspan_index(self, ...) \
c_PASTE(_cspan_i, c_NUMARGS(__VA_ARGS__))((self)->dim, __VA_ARGS__) + \
cspan_rank_ok(self, c_NUMARGS(__VA_ARGS__))
#define cspan_resize(self, ...) \
(void)memcpy((self)->dim, (uint32_t[]){__VA_ARGS__}, \
sizeof((self)->dim) + cspan_rank_ok(self, c_NUMARGS(__VA_ARGS__)))
#define cspan_at(self, ...) ((self)->data + cspan_index(self, __VA_ARGS__))
#define cspan_front(self) ((self)->data)
#define cspan_back(self) ((self)->data + cspan_size(self) - 1)
#define cspan_subspan(self, offset, count) \
{.data=cspan_at(self, offset), .dim={count}}
#define cspan_subspan2(self, offset, count) \
{.data=cspan_at(self, offset, 0), .dim={count, (self)->dim[1]}}
#define cspan_subspan3(self, offset, count) \
{.data=cspan_at(self, offset, 0, 0), .dim={count, (self)->dim[1], (self)->dim[2]}}
#define cspan_subspan4(self, offset, count) \
{.data=cspan_at(self, offset, 0, 0, 0), .dim={count, (self)->dim[1], (self)->dim[2], (self)->dim[3]}}
#define cspan_subdim4(...) c_MACRO_OVERLOAD(cspan_subdim4, __VA_ARGS__)
#define cspan_subdim3(...) c_MACRO_OVERLOAD(cspan_subdim3, __VA_ARGS__)
#define cspan_subdim2(self, x) \
{.data=cspan_at(self, x, 0), .dim={(self)->dim[1]}}
#define cspan_subdim3_2(self, x) \
{.data=cspan_at(self, x, 0, 0), .dim={(self)->dim[1], (self)->dim[2]}}
#define cspan_subdim3_3(self, x, y) \
{.data=cspan_at(self, x, y, 0), .dim={(self)->dim[2]}}
#define cspan_subdim4_2(self, x) \
{.data=cspan_at(self, x, 0, 0, 0), .dim={(self)->dim[1], (self)->dim[2], (self)->dim[3]}}
#define cspan_subdim4_3(self, x, y) \
{.data=cspan_at(self, x, y, 0, 0), .dim={(self)->dim[2], (self)->dim[3]}}
#define cspan_subdim4_4(self, x, y, z) \
{.data=cspan_at(self, x, y, z, 0), .dim={(self)->dim[3]}}
STC_INLINE size_t _cspan_i1(const uint32_t dim[1], uint32_t x)
{ c_ASSERT(x < dim[0]); return x; }
STC_INLINE size_t _cspan_i2(const uint32_t dim[2], uint32_t x, uint32_t y)
{ c_ASSERT(x < dim[0] && y < dim[1]); return dim[1]*x + y; }
STC_INLINE size_t _cspan_i3(const uint32_t dim[3], uint32_t x, uint32_t y, uint32_t z) {
c_ASSERT(x < dim[0] && y < dim[1] && z < dim[2]);
return dim[2]*(dim[1]*x + y) + z;
}
STC_INLINE size_t _cspan_i4(const uint32_t dim[4], uint32_t x, uint32_t y, uint32_t z, uint32_t w) {
c_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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