Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for a snapshot of the develop branch, built from commit 0f79ae966a.
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Writing a New Backend

The formal requirements for a backend to class number are given in the reference, but to help speed and simplify the process there is a header skeleton_backend.hpp where all the methods needed to be written are declared but nothing is implemented. The process of writing a new backend then simplifies to:

To test the new backend, start with a basic arithmetic test, this is a test case under libs/math/test that looks something like:

#include <boost/multiprecision/my_new_number_type.hpp>
#include "test_arithmetic.hpp"

int main()
{
   test<boost::multiprecision::my_new_number_type>();
   return boost::report_errors();
}

This will basically "instantiate everything", and perform a few runtime sanity checks; it is a very good test that you have written legal code!

You should also create a "header include test" that verifies that the new header includes everything it should, see mpfr_include_test.cpp for an example.

For integer types, you should add the new type to at least the following tests as well:

For floating point types, you should add the new type to at least the following tests as well:


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