haifenghuang/linq4c

LINQ for C(GroupBy, GroupJoin, Join, Take, Where, Select, etc)

Linq for C

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