Node:C++ Interface Integers, Next:, Previous:C++ Interface General, Up:C++ Class Interface


C++ Interface Integers

void mpz_class::mpz_class (type n) Function
Construct an mpz_class. All the standard C++ types may be used, except long long and long double, and all the GMP C++ classes can be used. Any necessary conversion follows the corresponding C function, for example double follows mpz_set_d (see Assigning Integers).

void mpz_class::mpz_class (mpz_t z) Function
Construct an mpz_class from an mpz_t. The value in z is copied into the new mpz_class, there won't be any permanent association between it and z.

void mpz_class::mpz_class (const char *s) Function
void mpz_class::mpz_class (const char *s, int base) Function
void mpz_class::mpz_class (const string& s) Function
void mpz_class::mpz_class (const string& s, int base) Function
Construct an mpz_class converted from a string using mpz_set_str, (see Assigning Integers). If the base is not given then 0 is used.

mpz_class operator/ (mpz_class a, mpz_class d) Function
mpz_class operator% (mpz_class a, mpz_class d) Function
Divisions involving mpz_class round towards zero, as per the mpz_tdiv_q and mpz_tdiv_r functions (see Integer Division). This corresponds to the rounding used for plain int calculations on most machines.

The mpz_fdiv... or mpz_cdiv... functions can always be called directly if desired. For example, 

mpz_class q, a, d;
...
mpz_fdiv_q (q.get_mpz_t(), a.get_mpz_t(), d.get_mpz_t());

mpz_class abs (mpz_class op1) Function
int cmp (mpz_class op1, type op2) Function
int cmp (type op1, mpz_class op2) Function
double mpz_class::get_d (void) Function
long mpz_class::get_si (void) Function
unsigned long mpz_class::get_ui (void) Function
bool mpz_class::fits_sint_p (void) Function
bool mpz_class::fits_slong_p (void) Function
bool mpz_class::fits_sshort_p (void) Function
bool mpz_class::fits_uint_p (void) Function
bool mpz_class::fits_ulong_p (void) Function
bool mpz_class::fits_ushort_p (void) Function
int sgn (mpz_class op) Function
mpz_class sqrt (mpz_class op) Function
These functions provide a C++ class interface to the corresponding GMP C routines.

cmp can be used with any of the classes or the standard C++ types, except long long and long double.


Overloaded operators for combinations of mpz_class and double are provided for completeness, but it should be noted that if the given double is not an integer then the way any rounding is done is currently unspecified. The rounding might take place at the start, in the middle, or at the end of the operation, and it might change in the future.

Conversions between mpz_class and double, however, are defined to follow the corresponding C functions mpz_get_d and mpz_set_d. And comparisons are always made exactly, as per mpz_cmp_d.