编写高质量代码

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}

return is_valid ;

}

bool is_valid_int64 ( const Double &value )

{

bool is_valid = true ;

int digits [ 2000 ];

int counts = 0 ;

if ( value . is_zero ()) {

is_valid = true ;

} else if ( value . is_neg ()) {

bool is_decimal = false ;

int digit = 0 ;

while (( digit = value . get_next_digit ( is_decimal )) != - 1 ) {

if ( is_decimal ) {

is_valid = false ;

break ;

} else {

digits [ counts ++ ] = digit ;

}

}

uint64_t tmp = 0 ;

uint64_t base = 1 ;

for ( int i = counts - 1 ; i >= 0 ; i ++ ) {

tmp += digits [ i ] * base ;

tmp *= - 1 ;

if ( tmp INT64_MIN ) {

is_valid = false ;

break ;

}

base *= 10 ;

}

} else {

bool is_decimal = false ;

int digit = 0 ;

while (( digit = value . get_next_digit ( is_decimal )) != - 1 ) {

if ( is_decimal ) {

is_valid = false ;

break ;

} else {

digits [ counts ++ ] = digit ;

}

}

uint64_t tmp = 0 ;

uint64_t base = 1 ;

for ( int i =

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