MacroLib

Caution

This is no longer maintained and used

Also, don't use too much C marco in project, it is just for fun

Language: zh

Some updates in the new preprocessor of Visual Studio 2019 and C++20 version

The new version marco lib in here: my-library-cpp-macro

What is it?

This repository contains some advanced techniques for macros. For example:

Delayed expansion
Distinguishing the number of parameters
Expanding different macros according to the parameter integer
Implementing default parameters
Create unique variable names
Even try catch in C, of course not traditional one
... and a bunch of derived syntactic sugar

Let see the main.c for demo:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <stdarg.h>

#include "SupportingMacro.h"
#include "ForLoopMacro.h"
#include "ArrayLoopingMacro.h"
#include "LinkedList.h"
#include "TryCatch.h"


double check_negative_function(double input) {
    if (input < 0) {
        throw(isNegative_FromFunction);
    }
}

double my_sqrt(double input) {
    check_negative_function(input);

    checkThrow(isNegative_FromFunction_changeName, 0.0);

    return sqrt(input);
}


#define check_negative_macro(input) \
    if (input < 0) { \
        giveThrow(isNegative_FromMacro); \
    }

double my_sqrt2(double input) {

    // 檢查值是否小於零，默認 給出 名爲 isNegative 的錯誤
    check_negative_macro(input);

    // 檢查有否發生錯誤，有則回傳括弧内的值
    check(0.0);

    return sqrt(input);
}



int main() {


    // easyFor() //
    // 1 至 100 的總和 //
    printf("[easyFor] 1 至 100 的總和\n");
    int sum_easyFor = 0;
    easyFor(i, 1, 100) {  // for(int i = 1; i <= 100; i++)
        sum_easyFor += i;
    }
    printf("%d\n", sum_easyFor);
    ln;


    // flexFor() //
    // 1 至 100 內奇數的總和 //
    printf("[flexFor] 1 至 100 內奇數的總和\n");
    int sum_flexFor = 0;
    flexFor(i, 1, 100, i += 2) {  // for(int i = 1; i <= 100; i+=2)
        sum_flexFor += i;
    }
    printf("%d\n", sum_flexFor);
    ln;


    // ffor() //
    // 計算 [1 至 100] 及 [101 至 200 內奇數] 的總和 //
    printf("[ffor] 計算 [1 至 100] 及 [101 至 200 內奇數] 的總和\n");
    int sum_ffor = 0;
    ffor(i, 1, 100) {  //easyFor(i, 1, 100)
        sum_ffor += i;
    }
    ffor(i, 101, 200, i += 2) {  //flexFor(i, 101, 200, i+=2)
        sum_ffor += i;
    }
    printf("%d\n", sum_ffor);  //12550
    ln;


    // loopBy() //
    // 遍歷 x * y 的二維陣列 //
    printf("[loopBy] 遍歷 x * y 的二維陣列\n");
#define x 3
#define y 4
    int array2d_loopBy[x][y] = { 0 };
    loopBy(i, x) {  // for(int i = 0; i != x; i++)
        loopBy(j, y) {  // for(int j = 0; j != x ; j++)
            printf("%d", array2d_loopBy[i][j]);
        }
        ln;
    }
#undef x
#undef y
    ln;


    // pureLoop() //
    // 輸出 n * n 的 * 方陣 //
    printf("[pureLoop] 輸出 n * n 的 * 方陣\n");
#define n 3
    pureLoop(n) {
        pureLoop(n) {
            printf("* ");
        }
        ln;
    }
#undef n
    ln;


    // loop2d() //
    // 遍歷 x * y 的二維陣列 //
    printf("[loop2d] 遍歷 x * y 的二維陣列\n");
#define x 3
#define y 4
    int array2d_loop2d[x][y] = { 0 };
    loop2d(i, x, j, y) {
        printf("%d", array2d_loop2d[i][j]);
        rightCurlyBracket
    ln;
    }
    ln;
#undef x
#undef y


    // loop2d() //
    // 二維純粹循環 //
    // 輸出 n * n 的 * 方陣 //
    printf("[loop2d] 輸出 n * n 的 * 方陣 \n");
#define n 3
    loop2d(n, n) {
        printf("* ");
        rightCurlyBracket
    ln;
    }
#undef n
    ln;


    // forech() //
    // 遍歷陣列 //
    printf("[forech] 遍歷陣列\n");
    int arr[10] = { 1, 3, 4, 2, 1, 2, 3, 7, 9, 1 };
    forech(int, x, arr,
        printf("%d ", x);
    );
    ln2;

    // ifTrue() //
    printf("[ifTrue]\n");
    printf("ifTrue(1, printf(\"OK\")) : ");  ifTrue(1, printf("OK")); ln;
    printf("ifTrue(0, printf(\"OK\")) : ");  ifTrue(0, printf("OK")); ln;
    ln;

    // ifFalse() //
    printf("[ifFalse]\n");
    printf("ifFalse(1, printf(\"OK\")) : "); ifFalse(1, printf("OK")); ln;
    printf("ifFalse(0, printf(\"OK\")) : "); ifFalse(0, printf("OK")); ln;
    ln;

    // conditionalOperator() // 
    printf("[conditionalOperator]\n");
    printf("conditionalOperator(1, exp1, exp2) : ");
    conditionalOperator(1, printf("exp1"), printf("exp2");); ln;
    printf("conditionalOperator(0, exp1, exp2) : ");
    conditionalOperator(0, printf("exp1"), printf("exp2"););
    ln2;

    // Linked List //
    printf("[Linked List] push 10, push 12, print\n");
    createLinkedList(list);
    pushFrontByValue(list, 10);
    pushFrontByValue(list, 12);
    printLinkedList(list);
    freeLinkedList(list);
    ln2;


    // 有發生錯誤，由 throw() 拋出 isNegative_FromFunction 錯誤
    check_negative_function(-10); try(ex1);

    // 有發生錯誤，由 check_negative_function() 的 throw() 拋出 isNegative_FromFunction 錯誤
    // checkThrow() 把錯誤名稱改爲 isNegative_FromFunction_changeName 錯誤
    my_sqrt(-20); try(ex2);

    // 有發生錯誤，由 giveThrow() 拋出 isNegative_FromMacro 錯誤
    // 由 check() 檢測並再次拋出
    my_sqrt2(-30); try(ex3);

    // 沒有發生錯誤
    my_sqrt2(40); try(ex4);

    // 有發生錯誤，由 giveThrow() 拋出 isNegative_FromMacro 錯誤
    // 由 check() 檢測並再次拋出
    // try() 把它改名為 tryChangeExeptionName 錯誤
    my_sqrt2(-50); try(ex5, tryChangeExeptionName);

    system("pause");

    // 正常到達這裏，會回傳括弧内的值 //
    catchStart(0);
    catch (isNegative_FromFunction) {
        printf("[isNegative_FromFunction] exception is happened!\n");
    }
    catch (isNegative_FromFunction_changeName) {
        printf("[isNegative_FromFunction_changeName] exception is happened!\n");
    }
    catch (isNegative_FromMacro) {
        printf("[isNegative_FromMacro] exception is happened!\n");
    }
    catch (tryChangeExeptionName) {
        printf("[changeExeptionName] exception is happened!\n");
    }
    finally() {
        printf("[finally()] exception is happened!\n\n");
    }
    // 標出所有返回點
    catchEnd(ex1, ex2, ex3, ex4, ex5)


    system("pause");
    return 0;
}

And the corresponding output:

[easyFor] 1 至 100 的總和
5050

[flexFor] 1 至 100 內奇數的總和
2500

[ffor] 計算 [1 至 100] 及 [101 至 200 內奇數] 的總和
12550

[loopBy] 遍歷 x * y 的二維陣列
0000
0000
0000

[pureLoop] 輸出 n * n 的 * 方陣
* * *
* * *
* * *

[loop2d] 遍歷 x * y 的二維陣列
0000
0000
0000

[loop2d] 輸出 n * n 的 * 方陣
* * *
* * *
* * *

[forech] 遍歷陣列
1 3 4 2 1 2 3 7 9 1

[ifTrue]
ifTrue(1, printf("OK")) : OK
ifTrue(0, printf("OK")) :

[ifFalse]
ifFalse(1, printf("OK")) :
ifFalse(0, printf("OK")) : OK

[conditionalOperator]
conditionalOperator(1, exp1, exp2) : exp1
conditionalOperator(0, exp1, exp2) : exp2

[Linked List] push 10, push 12, print
12 10

[isNegative_FromFunction] exception is happened!
[finally()] exception is happened!

[isNegative_FromFunction_changeName] exception is happened!
[finally()] exception is happened!

[isNegative_FromMacro] exception is happened!
[finally()] exception is happened!

[changeExeptionName] exception is happened!
[finally()] exception is happened!

`SupportingMacro.h`

#pragma once

#define ln putchar('\n')
#define ln2 printf("\n\n")

#define refer *

#define leftBracket (
#define rightBracket )

#define leftCurlyBracket {
#define rightCurlyBracket }

#define comma ,

#define midLayer(...) __VA_ARGS__
#define eatComma(...) ,##__VA_ARGS__

#define linkMacro_body(a, b) a ## b
#define linkMacro(a, b) linkMacro_body(a, b)
#define uniqueVarName(name) linkMacro(name, __COUNTER__)
#define uniqueVarName2(name) linkMacro_body leftBracket name, __COUNTER__ )

#define get1th(a1, ...) a1
#define get2th(a1, a2, ...) a2
#define get3th(a1, a2, a3, ...) a3
#define get4th(a1, a2, a3, a4, ...) a4
#define get5th(a1, a2, a3, a4, a5, ...) a5
#define get6th(a1, a2, a3, a4, a5, a6, ...) a6
#define get7th(a1, a2, a3, a4, a5, a6, a7, ...) a7
#define get8th(a1, a2, a3, a4, a5, a6, a7, a8, ...) a8
#define get9th(a1, a2, a3, a4, a5, a6, a7, a8, a9, ...) a9
#define get10th(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, ...) a10

#define get1thVS(...) midLayer( get1th(__VA_ARGS__) )
#define get2thVS(...) midLayer( get2th(__VA_ARGS__) )
#define get3thVS(...) midLayer( get3th(__VA_ARGS__) )
#define get4thVS(...) midLayer( get4th(__VA_ARGS__) )
#define get5thVS(...) midLayer( get5th(__VA_ARGS__) )
#define get6thVS(...) midLayer( get6th(__VA_ARGS__) )
#define get7thVS(...) midLayer( get7th(__VA_ARGS__) )
#define get8thVS(...) midLayer( get8th(__VA_ARGS__) )
#define get9thVS(...) midLayer( get9th(__VA_ARGS__) )
#define get10thVS(...) midLayer( get10th(__VA_ARGS__) )

#define parameterNum(...) get10thVS(__VA_ARGS__, 9, 8, 7, 6 , 5, 4, 3, 2, 1)

#define select0_1(m0, m1, ...) get3th leftBracket eatComma(__VA_ARGS__), m1, m0 )
#define select0_2(m0, m1, m2, ...) get4th leftBracket eatComma(__VA_ARGS__), m2, m1, m0)
#define select0_3(m0, m1, m2, m3, ...) get5th leftBracket eatComma(__VA_ARGS__), m3, m2, m1, m0)
#define select0_4(m0, m1, m2, m3, m4, ...) get6th leftBracket eatComma(__VA_ARGS__), m4, m3, m2, m1, m0)
#define select0_5(m0, m1, m2, m3, m4, m5, ...) get7th leftBracket eatComma(__VA_ARGS__), m5, m4, m3, m2, m1, m0)
#define select0_6(m0, m1, m2, m3, m4, m5, m6, ...) get8th leftBracket eatComma(__VA_ARGS__), m6, m5, m4, m3, m2, m1, m0)
#define select0_7(m0, m1, m2, m3, m4, m5, m6, m7, ...) get9th leftBracket eatComma(__VA_ARGS__), m7, m6, m5, m4, m3, m2, m1, m0)
#define select0_8(m0, m1, m2, m3, m4, m5, m6, m7, m8, ...) get10th leftBracket eatComma(__VA_ARGS__), m8, m7, m6, m5, m4, m3, m2, m1, m0)

#define select0_1VS(va_args, m0, m1) select_va_args_0_1(m1, m0, va_args)
#define select0_2VS(va_args, m0, m1, m2) select_va_args_0_2(m2, m1, m0, va_args)
#define select0_3VS(va_args, m0, m1, m2, m3) select_va_args_0_3(m3, m2, m1, m0, va_args)
#define select0_4VS(va_args, m0, m1, m2, m3, m4) select_va_args_0_4(m4, m3, m2, m1, m0, va_args)
#define select0_5VS(va_args, m0, m1, m2, m3, m4, m5) select_va_args_0_5(m5, m4, m3, m2, m1, m0, va_args)
#define select0_6VS(va_args, m0, m1, m2, m3, m4, m5, m6) select_va_args_0_6(m6, m5, m4, m3, m2, m1, m0, va_args)
#define select0_7VS(va_args, m0, m1, m2, m3, m4, m5, m6, m7) select_va_args_0_7(m7, m6, m5, m4, m3, m2, m1, m0, va_args)
#define select0_8VS(va_args, m0, m1, m2, m3, m4, m5, m6, m7, m8) select_va_args_0_8(m8, m7, m6, m5, m4, m3, m2, m1, m0, va_args)

`ArrayLoopingMacro.h`

#pragma once

#include "SupportingMacro.h"

#define arrLength(arr) \
    (sizeof(arr) / sizeof(arr[0]))

// 針對遍歷陣列，默認 var 從 0 開始，遞增為 1
#define loopBy(var, ...) \
    for(int var = 0; var != __VA_ARGS__; var++)

// 不在乎循環變量，只要單純的重複次數
#define pureLoop(...) \
    loopBy( uniqueVarName(macroLoopTempVar), __VA_ARGS__)

// 合併兩個 Looping
#define loop(p1, ...)                  \
    select0_1(pureLoop(p1),            \
              loopBy(p1, __VA_ARGS__), \
              __VA_ARGS__)

// 遍歷二維陣列的 Looping
#define loopBy2d(var1, times1, var2, ...) \
    loopBy(var1, times1){                 \
        loopBy(var2, __VA_ARGS__)

// 二維純粹循環
#define pureLoop2d(n, ...) \
    pureLoop(n){           \
        pureLoop(__VA_ARGS__)

// 合併兩個二維 Looping
#define loop2d(p1, p2, ...)                    \
    select0_2(pureLoop2d(p1, p2),              \
              pureLoop2d(p1, p2, __VA_ARGS__), \
              loopBy2d(p1, p2, __VA_ARGS__),   \
              __VA_ARGS__)

`ForLoopMacro.h`

#pragma once

#include "SupportingMacro.h"

// 簡化版 for loop
#define easyFor(var, start, end) \
    for(int var = start; var <= end; var++)

// 較靈活的 for loop
#define flexFor(var, start, end, ...) \
    for(int var = start; var <= end; __VA_ARGS__)

// 合併以上兩個 for loop
#define ffor(var, start, end, ...)                   \
    select0_1(easyFor(var, start, end),              \
              flexFor(var, start, end, __VA_ARGS__), \
              __VA_ARGS__)

// forech
#define forech(type, var, list, ...) \
    loopBy(i, arrLength(list)){      \
        type var = list[i];          \
        __VA_ARGS__                  \
	}

Name		Name	Last commit message	Last commit date
Latest commit History 56 Commits
MacroLib		MacroLib
src		src
.gitattributes		.gitattributes
LICENSE		LICENSE
README.md		README.md
README_zh.md		README_zh.md

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MacroLib

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