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The following functions are provided in libgmpxx (see Headers and Libraries), which is built only if C++ support is enabled (see Build Options). Prototypes are available from <gmp.h>
.
Read rop from stream, using its ios
formatting settings.
An integer like ‘123’ will be read, or a fraction like ‘5/9’. No
whitespace is allowed around the ‘/’. If the fraction is not in
canonical form then mpq_canonicalize
must be called (see Rational Number Functions) before operating on it.
As per integer input, an ‘0’ or ‘0x’ base indicator is read when
none of ios::dec
, ios::oct
or ios::hex
are set. This is
done separately for numerator and denominator, so that for instance
‘0x10/11’ is 16/11 and ‘0x10/0x11’ is 16/17.
Read rop from stream, using its ios
formatting settings.
Hex or octal floats are not supported, but might be in the future, or perhaps
it’s best to accept only what the standard float operator>>
does.
Note that digit grouping specified by the istream
locale is currently
not accepted. Perhaps this will change in the future.
These operators mean that GMP types can be read in the usual C++ way, for example,
mpz_t z; ... cin >> z;
But note that istream
input (and ostream
output, see C++ Formatted Output) is the only overloading available for the GMP types and
that for instance using +
with an mpz_t
will have unpredictable
results. For classes with overloading, see C++ Class Interface.
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