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c++boostfloating-point-precisionmultiprecision
user1403546
user1403546

Reputation: 1749

C++: convert "boost::multiprecision::float128" to "double"

I'm using the boost multiprecision library, and more precisely the boost::multiprecision::float128 type. Using ICPC for compiling, I get some errors when trying to to do something like:

double a = functionA();

where functionA() return a boost::multiprecision::float128 variable.

error: no suitable conversion function from "boost::multiprecision::float128" to "double" exists|

How can I solve this?

Upvotes: 6

Views: 3834

Answers (1)

Richard Critten
Richard Critten

Reputation: 2145

From the Boost documentation:

A number can be converted to any built in type, via the convert_to member function:

mpz_int z(2);
double i = z.convert_to<double>(); // sets i to 2

http://www.boost.org/doc/libs/1_57_0/libs/multiprecision/doc/html/boost_multiprecision/tut/conversions.html

Upvotes: 16

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