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linq4c's Introduction

Linq for C

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Features

  • Most of the LINQ methods(60+) are supported.
  • Chaining of LINQ methods are supported.
  • Lambda is supported(slow).

Examples

For more examples, please see the main.c file.

Example using callbacks

#include <gc.h>
#include "ArrayList.h"
#include "linq.h"

bool WhereCallback(void *item) {
    char *str= (char *)item;
    return str[0] == 'h';
}

void *SelectCallback(void *item) {
    return newStr("%s_1", (char *)item);
}

ArrayList testLinq(ArrayList array) {
    Linq *lq = From(array);

    ArrayList result =
        lq
        ->Where(lq, WhereCallback)
        ->Select(lq, SelectCallback)
        ->ToArray(lq);

    return result;
}

int main() {
    GC_INIT();

    char *str1 = "huang", *str2 = "hai", *str3 = "feng";

    ArrayList array = arrlist_new();
    arrlist_append(array, str1);
    arrlist_append(array, str2);
    arrlist_append(array, str3);

    ArrayList result = testLinq(array);
    for(int i = 0; i < arrlist_size(result); i++) {
        printf("%s\n", arrlist_get(result, i));
    }

    return 0;
}

Example with lambdas

ArrayList testLinq(ArrayList array) {
    Linq *lq = From(array);

    ArrayList result =
        lq
        ->Where(lq,
                lambda(bool, (void *item) {
                    char *str= (char *)item;
                    return str[0] == 'h';
                }))
        ->Select(lq,
                 lambda(void *, (void *item) {
                     return newStr("%s_1", (char *)item);
                 }))
        ->ToArray(lq);

    return result;
}

int main() {
    GC_INIT();

    char *str1 = "huang", *str2 = "hai", *str3 = "feng";

    ArrayList array = arrlist_new();
    arrlist_append(array, str1);
    arrlist_append(array, str2);
    arrlist_append(array, str3);

    ArrayList result = testLinq(array);
    for(int i = 0; i < arrlist_size(result); i++) {
        printf("%s\n", arrlist_get(result, i));
    }

    return 0;
}

Example with macros

#define LINQ_PTR lq

bool WhereCallback(void *item) {
    char *str= (char *)item;
    return str[0] == 'h';
}

void *SelectCallback(void *item) {
    return newStr("%s_1", (char *)item);
}

ArrayList testLinq(ArrayList array) {
    Linq *lq = From(array);

    ArrayList result =
        lq
        ->WHERE(WhereCallback)
        ->SELECT(SelectCallback)
        ->TO_ARRAY();

    return result;
}

int main(int argc, char **argv) {
    GC_INIT();

    char *str1 = "huang", *str2 = "hai", *str3 = "feng";

    ArrayList array = arrlist_new();
    arrlist_append(array, str1);
    arrlist_append(array, str2);
    arrlist_append(array, str3);

    ArrayList result = testLinq(array);
    for(int i = 0; i < arrlist_size(result); i++) {
        printf("%s\n", arrlist_get(result, i));
    }

    return 0;
}

Requirement

As for the garbage collect, you need to install Boehm GC.

# yum install gc-devel      # RedHat family
# apt-get install libgc-dev # Debian family

What's implemented


  • Where
  • WhereIndexed
  • Select
  • SelectIndexed
  • SelectMany
  • SelectManyIndexed
  • SelectManyBy
  • FirstOrDefault
  • LastOrDefault
  • Take
  • TakeEvery
  • TakeWhile
  • TakeWhileIndexed
  • TakeExceptLast
  • TakeFromLast
  • Skip
  • SkipWhile
  • SkipWhileIndexed
  • Any
  • All
  • Reverse
  • IndexOf
  • LastIndexOf
  • Concat
  • Except
  • Union
  • Intersect
  • SumInts
  • SumFloats
  • MaxInts
  • MaxFloats
  • MinInts
  • MinFloats
  • AverageInts
  • AverageFloats
  • Max
  • Min
  • OrderBy
  • OrderByDesc
  • GroupBy
  • Zip
  • Single
  • SingleWith
  • Contains
  • Count
  • CountWith
  • JoinStr
  • Join
  • GroupJoin
  • Aggregate
  • AggregateWithSeed
  • AggregateWithSeedBy
  • SequenceEqual
  • Prepend
  • Append
  • ForEach
  • AlternateBefore
  • AlternateAfter
  • Shuffle
  • Slice
  • Pad
  • PadBy
  • Print
  • Println

License

MIT

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linq4c's Issues

the way to compile

$ which gcc
/usr/bin/gcc
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl --disable-libmpx --enable-offload-targets=nvptx-none --without-cuda-driver --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
Thread model: posix
gcc version 8.3.1 20190507 (Red Hat 8.3.1-4) (GCC)
$ make
/usr/bin/gcc -D_GNU_SOURCE -g -I. ArrayList.c linq.c hashmap.c main.c  -lpthread  -o linq -lgc
/usr/bin/gcc -D_GNU_SOURCE -g -I. ArrayList.c linq.c hashmap.c main_macro.c -lpthread  -o linq_macro -lgc
$ ./linq

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