BigMath

Reqs

cmake >= 3.12
gnu gcc 5+/clang 5+/msvc
make
GMP or MPIR
mpdecimal

Usage and features

Namespace for all things is bigmath

Arbitrary precision decimal numbers:

#include <bigmath/bigdecimal.h>
#include <bigmath/bigint.h>

void do_something() {
    bigmath::bigdecimal val("124.450200000000000200");
    bigmath::bigdecimal base("1000000000000000000");
    bigmath::bigdecimal res = val * base;
    bigmath::bigint = res.to_bigint();
    
    // just output as-is
    std::cout << res << std::endl;
    // output with only 6 digits after point (format string has Python syntax)
    std::cout << res.format(".6f") << std::endl;
    // convert decimal to bigint (drops everything after point)
    std::cout << res.to_bigint() << std::endl;
}

Add to project

Using Conan

Add remote:

conan remote add edwardstock https://edwardstock.jfrog.io/artifactory/api/conan/conan

conan install <path/to/your/project> bigmath/1.0.4@edwardstock/latest

or using conanfile.txt

[requires]
bigmath/1.0.8@edwardstock/latest

[generators]
cmake

Using RPM package

Supported distributions:

centos 7, 8
fedora 32-34

Steps:

Create edwardstock.repo file inside /etc/yum.repos.d
Add below to this file

[edwardstock]
name = edwardstock
baseurl = https://edwardstock.jfrog.io/artifactory/rhel/[centos or fedora]/\$releasever/\$basearch
enabled = 1
gpgcheck = 0
gpgkey = https://edwardstock.jfrog.io/artifactory/rhel/[centos or fedora]/\$releasever/\$basearch/repodata/repomd.xml.key
repo_gpgcheck = 1

Update repository yum -y update or dnf update
Install lib yum install bigmath-devel

Using DEB package

Supported distributions:

debian: stretch, buster
ubuntu: xenial, bionic, focal, groovy

echo "deb https://edwardstock.jfrog.io/artifactory/debian $(lsb_release -c -s) main" | sudo tee -a /etc/apt/sources.list
curl -s https://edwardstock.jfrog.io/artifactory/api/gpg/key/public | sudo apt-key add -
apt update && apt install libbigmath-dev

Using CMake

Add submodule or just clone
- git submodule add https://github.com/edwardstock/bigmath.git /path/to/libs/bigmath
- git clone https://github.com/edwardstock/bigmath.git /path/to/libs/bigmath
Edit CMakeLists.txt:

# your executable or library
add_executable(my_executable)
#or if library
add_library(my_library)

# include module
add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/path/to/libs/bigmath)

# link with your project
target_link_libraries(my_[executable|library] bigmath)

Global Install

This library requires to be built

If you have conan, then just build, dependencies automatically will be installed and build (if required)

git clone https://github.com/edwardstock/bigmath.git bigmath && mkdir -p build && cd bigmath/build
cmake --build . --target install

If you DON'T have conan, then you have to install dependencies by yourself:

libgmp or libmpir
mpdecimal (source link is on the top of readme)

git clone https://github.com/edwardstock/bigmath.git bigmath && mkdir -p build && cd bigmath/build
cmake .. -DCMAKE_BUILD_TYPE=Release -DENABLE_CONAN=Off
cmake --build . --target install

Testing

git clone https://github.com/edwardstock/bigmath.git bigmath && mkdir -p build && cd bigmath/build
cmake .. -DCMAKE_BUILD_TYPE=Debug -DENABLE_TEST=On
cmake --build . --target bigmath-test
./bin/bigmath-test