Implementation of Any type in C

any.h

#ifndef ANY_H
#define ANY_H

#include <stdbool.h>
#include <stdint.h>

enum Variant {
    V_ANY,
    V_STRING,
    V_CHAR,
    V_INT,
    V_DOUBLE,
    V_FLOAT,
    V_LONG,
    V_BOOL,
    V_NULL,
    V_LONG_DOUBLE,
    V_POINTER,
};

typedef struct Any {
    union {
        char c;
        char *s;
        int i;
        double d;
        float f;
        long l;
        long double ld;
        void *vp;
        bool b;
    } value;
    enum Variant type;
} Any;

#define typeof(var) _Generic( (var),\
char: V_CHAR,\
char *: V_STRING,\
int: V_INT,\
int *: V_INT,\
double: V_DOUBLE,\
double *: V_DOUBLE,\
float: V_FLOAT,\
float *: V_FLOAT,\
long: V_LONG,\
long *: V_LONG,\
void *: V_POINTER,\
bool: V_BOOL,\
bool *: V_BOOL,\
long double: V_LONG_DOUBLE,\
default: V_NULL)

Any __any__(enum Variant type, void *ptr) {
    Any x;
    x.type = type;

    if (type == V_CHAR) {
        x.value.c = *(char *) ptr;
    } else if (type == V_STRING) {
        x.value.s = (char *) ptr;
    } else if (type == V_INT) {
        x.value.i = *(int *) ptr;
    } else if (type == V_DOUBLE) {
        x.value.d = *(double *) ptr;
    } else if (type == V_FLOAT) {
        x.value.f = *(float *) ptr;
    } else if (type == V_LONG) {
        x.value.l = *(long *) ptr;
    } else if (type == V_LONG_DOUBLE) {
        x.value.ld = *(long double *) ptr;
    } else if (type == V_BOOL) {
        x.value.b = *(bool *) ptr;
    } else {
        x.value.vp = ptr;
    }

    return x;
}

#define ptr(value) ((void*)(&(value)))

#define any(v) ({\
enum Variant type = typeof(v);\
__any__(type, ptr(v));\
})

#define unwrap(any, type) *(type *)_unwrap(&(any))

void *_unwrap(Any *any) {
    switch (any->type) {
        case V_CHAR: return &any->value.c;
        case V_STRING: return any->value.s;
        case V_INT: return &any->value.i;
        case V_DOUBLE: return &any->value.d;
        case V_FLOAT: return &any->value.f;
        case V_LONG: return &any->value.l;
        case V_LONG_DOUBLE: return &any->value.ld;
        case V_BOOL: return &any->value.b;
        case V_POINTER: return any->value.vp;
        default: return NULL;
    }
}

#endif