Construction From vector<char> ?
marc.glisse at normalesup.org
Tue Aug 12 20:58:31 CEST 2008
On Tue, 12 Aug 2008, Robert Evans wrote:
> I am trying to migrate some C++ code based on STL vector<char> - based
> arrays to mpz_class. Is there an efficient way to construct an
> mpz_class object from a vector<char> without explicitly iterating over
> the vector? I could not find a constructor based on an STL vector,
> nor could I find a string constructor based on vector<char> (which I
> could then feed into mpz_class(const string&) ).
It all depends on what the vector<char> is supposed to represent. If it
was used in place of a string (as a list of the ascii representations of
the digits of a base 10 representation of the number), you can easily
create a string from your vector v, with:
(the second one was not legal in early C++)
Note that the internal representation of a long integer in gmp is a C
equivalent to vector<unsigned long> so the meaning of a vector is not
something clear without specifying what it is supposed to represent.
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