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White Owl's questions

Martin Hope
White Owl
Asked: 2025-04-22 04:32:03 +0800 CST
  • 11

Supondo que eu tenha um código como este:

#include <stdio.h>

// A numbered enum with gaps
#define COLORS(X)  \
    X(RED,    10)  \
    X(GREEN,  2)   \
    X(BLUE,   5)   \
    X(YELLOW, 7)

typedef enum {
#define XX(N, M) CLR_##N = M,
    COLORS(XX)
#undef XX
} colors_e;

// This define must have the highest value of enum
#define MAX_COLOR_CODE 10 

typedef struct {
    char *language;
    // the define is needed for array definition inside a struct
    char *colors[MAX_COLOR_CODE + 1];
} color_names_t;

// The array of struct is selectively filled at compile time, hence use of enum for indexing
color_names_t color_names[] = {
    {"en", {[CLR_RED] = "red", [CLR_BLUE] = "blue", [CLR_GREEN] = "green"}},
    {"du", {[CLR_BLUE] = "blau", [CLR_YELLOW] = "gelb", [CLR_RED] = "rot"}},
};


/// ---- a sample usage of the defined array of structs

#define ARR_SIZE(X) (sizeof(X)/sizeof(X[0]))

int main() {
    for(int lidx=0; lidx<ARR_SIZE(color_names); lidx++) {
        printf("Language: %s\n", color_names[lidx].language);

        for(int idx=0; idx<ARR_SIZE(color_names[0].colors); idx++) {
            if(color_names[lidx].colors[idx])
                printf("\t%s\n", color_names[lidx].colors[idx]);
        }
    }

    return 0;
}

Existe uma maneira de calcular automaticamente uma MAX_COLOR_CODEdefinição?

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