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Questions tagged [boost-multiprecision]

Boost library for numeric types with arbitrary precision.

The Boost Multiprecision library is a C++ template library that allows the use of numeric types with a greater precision than built-in types. It has templates for integer and floating-point types, and can work with other libraries like and .

Documentation is available on the Boost website.

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boost::multiprecision random number with fixed seed and variable precision

When using a fixed seed inside a rng, results are not reproducible when precision is varied. Namely, if one changes the template argument cpp_dec_float and runs the following code, different outputs are seen (for each change in…
algae
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Unit tests with boost::multiprecision

Some of my unit tests have started failing since adapting some code to enable multi-precision. Header file: #ifndef SCRATCH_UNITTESTBOOST_INCLUDED #define SCRATCH_UNITTESTBOOST_INCLUDED #include // typedef…
algae
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How to set rounding mode in Boost Multiprecision when using MPFR

I am trying to figure out how I can format mpfr_float numbers using a rounding mode in Boost Multiprecision. In the below example, I expect 1.55 to round to either 1.5 or 1.6 depending on which rounding mode is used, but instead for all cases it…
Jay
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Type trait for boost multiprecision integers

I want to write a type trait to identify boost multiprecision integer types. I can do this for a concrete type like uint256_t: template struct is_multiprecision_int : std::false_type {}; template <> struct…
Silicomancer
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boost float128 support for windows 10

I would like to get 128 bit floating precision working for my C++ application on Windows. Currently I am able to do this on both Linux and macOS, using the g++ compilers with the quadmath and boost::multiprecision::float128 libraries. On Windows,…
Juan
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Why does odeint fail with the newer versions of odeint?

I was struggling with the new version of boost. I am using odeint with mupltiprecision. The following piece of code can be successfully compiled with boost version 1.67.0. However, since version 1.68.0 and newer, I can no longer compile. In version…
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Find First Set instruction (ffs) for boost multiprecision uint512_t

I'm developing an algorithm that uses __builtin_ffsll() with uint64_t type. I want to switch to 512-bit field using boost multiprecision library (I'm running on a machine with avx512 support). Is there a similar function as the mentioned builtin?…
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how to work around boost::multiprecision::cpp_dec_float division error

Division with boost::multiprecision::cpp_dec_float have some kind of rounding error, as follows: #include #include using my_t =…
Gabriel
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What is the highest limit for boost-multiprecision cpp_int?

I'm working on factoring large semi-prime numbers. I am working on Java but I am just curious to explore other options as well. I know C++ Boost multiprecision supports large numbers. I found the following information from Boost page: typedef…
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Mysterious stackoverflow exception in boost::multiprecision::gmp_float::operator=?

I am trying to calculate pi for one of my university project using Ramanujan's formula for arbitrary number of digits after the floating point. For the job, I am using boost::multiprecision library that is simply wrapper around mpfr and mpir I…
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Is it possible to set a deterministic seed for boost::random::uniform_int_distribution<>?

I'm using boost::random::uniform_int_distribution to generate some unit tests. Notice that I'm using multiprecision, which is why I need to use boost and not the standard library. For my periodic tests, I need to…
The Quantum Physicist
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Building a large boost unordered_map with cpp_int

I am writing some code in c++ for a class assignment that requires work with multiprecision library such as boost. Basically, I need to build a hash table with some large integers and then lookup a certain value in that table. When I use h, g, p…
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How to take a base 2 logarithm from a boost int256_t?

So I want to take a logarithm from an int256_t. I found this but modifying it to take sizeof int256_t did not work. It will give incorrect results: https://stackoverflow.com/a/11376759 Is there a log function in boost which supports multiprecision?
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boost::multiprecision::number

I'm new in using boost library, so I thanked every one that helps me. #include "gmpxx.h" #include #include #include using namespace std; using…
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Creating a static lookup table when the integer type is Boost multiprecision number/cpp_int

I'd like to create a static lookup table for powers of ten returned as type boost::mulitprecision's uint256_t: static uint256_t power_ten(const uint8_t n) { static const uint256_t table[] = { 1, 10 // etc }; …
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