refactor

erl
Erlang R15B01 (erts-5.9.1) [source] [64-bit] [smp:4:4] [async-threads:0] [kernel-poll:false]

Eshell V5.9.1  (abort with ^G)

1> erlang:system_info(cpu_topology).
[{processor,[{core,[{thread,{logical,0}},
                    {thread,{logical,1}}]},
             {core,[{thread,{logical,2}},{thread,{logical,3}}]}]}]

refactor

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 23
model name	: Intel(R) Core(TM)2 Quad CPU    Q8300  @ 2.50GHz
stepping	: 10
microcode	: 0xa07
cpu MHz		: 2493.898
cache size	: 2048 KB
physical id	: 0

refactor

Here's a list of mildly interesting things about the C language that I learned over time. There are many more mildly interesting features of C++, but the language is literally known for being weird, whereas C is usually considered smaller and simpler, so this is (almost) only about C.

1. Combined type and variable/field declaration, inside a struct scope [https://godbolt.org/g/Rh94Go]

struct foo {
   struct bar {
       int x;
   } baz;
};

refactor

#include <ogr_srs_api.h>
#include <cpl_conv.h>

int main(void) {
    OGRSpatialReferenceH sr = OSRNewSpatialReference(NULL);
    OSRImportFromEPSG(sr, 3857);
//    OSRSetWellKnownGeogCS(sr, "WGS84");
    char* ppsz;
    OSRExportToPrettyWkt(sr, &ppsz, FALSE);
    printf("3857.wkt: \n%s\n", ppsz);

refactor

#include <cpl_conv.h>
#include <ogr_srs_api.h>
#include <gdalwarper.h>

/*
* https://www.gdal.org/warptut.html
*/
int main()
{
    GDALAllRegister();

refactor

-include_lib("xmerl/include/xmerl.hrl").

%% tuple -> xml-erl
TL = {filemeta,[{id,'/Foo'},{bar,12111111113}], [{name,["11"]},{age,["1"]}]}.
XmlDoc = xmerl:export_simple([TL], xmerl_xml).

%% xml-erl -> tuple
TL = xmerl_lib:simplify_element(XmlDoc).

refactor

#define FL_ARG_COUNT(...) FL_INTERNAL_ARG_COUNT_PRIVATE(0, ##__VA_ARGS__, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
#define FL_INTERNAL_ARG_COUNT_PRIVATE(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, N, ...) N

#define FL_CONCAT_(l,r) l ## r
#define FL_CONCAT(l,r) FL_CONCAT_(l,r)

extern VkImageView _createImageView(VkDevice device, VkImage image, VkFormat format, VkImageAspectFlags aspectFlags);

#define _CREATE_IMAGE_VIEW_1(DEV,IMG)           _createImageView(DEV,IMG,VK_FORMAT_R8G8B8A8_SRGB,VK_IMAGE_ASPECT_COLOR_BIT)
#define _CREATE_IMAGE_VIEW_2(DEV,IMG, fmt)      _createImageView(DEV,IMG,fmt,VK_IMAGE_ASPECT_COLOR_BIT)

refactor

> io_lib:format("~2.16.0B", [15]).
0F

> io_lib:format("~2.16.#b", [15]).
"#f"

> io_lib:format("~2.2.#b", [1]).
"#1"
> io_lib:format("~2.2.#b", [2]).
"10"

refactor

export ERL_AFLAGS="-kernel shell_history_path '\".erl_history\"' -kernel shell_history enabled"

refactor

void scale_circ(Circle_s c[static 1], double scale) {
    c->radius *= scale;
}

void scale_rect(Rectangle_s r[static 1], double scale) {
    r->w *= scale;
    r->h *= scale;
}

#define scale(obj, scale)      \