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mp++ is a C++11 library for multiprecision arithmetic, currently supporting
arbitrary-precision integers, rationals and floats, and quadruple-precision
floats.
Based on well-known libraries such as GMP, MPFR, and others, mp++ was initially
conceived as a GMP wrapper with a special focus on performance with small
operands. In particular, a small buffer optimisation and custom implementations
of basic mathematical primitives are instrumental in achieving a performance
increase, with respect to GMP and other integer multiprecision libraries, which
can be substantial (see the benchmarks section of the documentation). The price
to pay is a small overhead when operating on large integers.
Eventually, a multiprecision rational class and two multiprecision
floating-point classes were added, and today a secondary objective of mp++ is to
provide a modern, consistent and unified C++ interface to several lower-level
multiprecision libraries.
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