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.editorconfig
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end_of_line = lf
insert_final_newline = true
trim_trailing_whitespace = true
# Preserve Markdown hard line breaks
[*.md]
trim_trailing_whitespace = false
# XML and MSBuild files
[*.{xml,csproj,props,targets,slnx,runsettings}]
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# JSON files
[*.json]
indent_size = 2
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[*.cs]
#### Core EditorConfig Options ####
# Indentation and spacing
indent_size = 4
tab_width = 4
# New line preferences
end_of_line = lf
insert_final_newline = true
#### .NET diagnostic severity
[*.{cs,vb}]
# CS9124: Parameter is captured into the state of the enclosing type and its value is also used to initialize a field, property, or event.
dotnet_diagnostic.CS9124.severity = error
# CS9107: Parameter is captured into the state of the enclosing type and its value is also passed to the base constructor. The value might be captured by the base class as well.
dotnet_diagnostic.CS9107.severity = error
# Build enforcement for the existing warning-level style preferences
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dotnet_diagnostic.IDE0062.severity = warning
dotnet_diagnostic.IDE0065.severity = warning
#### .NET Coding Conventions ####
[*.{cs,vb}]
# Organize usings
dotnet_separate_import_directive_groups = false
dotnet_sort_system_directives_first = true
file_header_template = unset
# this. and Me. preferences
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# Language keywords vs BCL types preferences
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dotnet_style_predefined_type_for_member_access = true:silent
# Parentheses preferences
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# Parameter preferences
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# Suppression preferences
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#### C# Coding Conventions ####
[*.cs]
# var preferences
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csharp_style_var_for_built_in_types = false:silent
csharp_style_var_when_type_is_apparent = false:silent
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csharp_style_inlined_variable_declaration = true:suggestion
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csharp_style_unused_value_assignment_preference = discard_variable:suggestion
csharp_style_unused_value_expression_statement_preference = discard_variable:silent
# 'using' directive preferences
csharp_using_directive_placement = outside_namespace:warning
#### C# Formatting Rules ####
# New line preferences
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csharp_new_line_before_else = true
csharp_new_line_before_finally = true
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csharp_new_line_before_members_in_object_initializers = true
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csharp_indent_braces = false
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# Space preferences
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csharp_space_after_colon_in_inheritance_clause = true
csharp_space_after_comma = true
csharp_space_after_dot = false
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# Wrapping preferences
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csharp_preserve_single_line_statements = true
#### Naming styles ####
# IDE0161: Convert to file-scoped namespace
csharp_style_namespace_declarations = file_scoped:warning
dotnet_diagnostic.IDE0161.severity = warning
[*.{cs,vb}]
# Naming rules
dotnet_naming_rule.types_and_namespaces_should_be_pascalcase.severity = suggestion
dotnet_naming_rule.types_and_namespaces_should_be_pascalcase.symbols = types_and_namespaces
dotnet_naming_rule.types_and_namespaces_should_be_pascalcase.style = pascalcase
dotnet_naming_rule.interfaces_should_be_ipascalcase.severity = suggestion
dotnet_naming_rule.interfaces_should_be_ipascalcase.symbols = interfaces
dotnet_naming_rule.interfaces_should_be_ipascalcase.style = ipascalcase
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dotnet_naming_rule.type_parameters_should_be_tpascalcase.symbols = type_parameters
dotnet_naming_rule.type_parameters_should_be_tpascalcase.style = tpascalcase
dotnet_naming_rule.methods_should_be_pascalcase.severity = suggestion
dotnet_naming_rule.methods_should_be_pascalcase.symbols = methods
dotnet_naming_rule.methods_should_be_pascalcase.style = pascalcase
dotnet_naming_rule.properties_should_be_pascalcase.severity = suggestion
dotnet_naming_rule.properties_should_be_pascalcase.symbols = properties
dotnet_naming_rule.properties_should_be_pascalcase.style = pascalcase
dotnet_naming_rule.events_should_be_pascalcase.severity = suggestion
dotnet_naming_rule.events_should_be_pascalcase.symbols = events
dotnet_naming_rule.events_should_be_pascalcase.style = pascalcase
dotnet_naming_rule.local_variables_should_be_camelcase.severity = suggestion
dotnet_naming_rule.local_variables_should_be_camelcase.symbols = local_variables
dotnet_naming_rule.local_variables_should_be_camelcase.style = camelcase
dotnet_naming_rule.local_constants_should_be_camelcase.severity = suggestion
dotnet_naming_rule.local_constants_should_be_camelcase.symbols = local_constants
dotnet_naming_rule.local_constants_should_be_camelcase.style = camelcase
dotnet_naming_rule.parameters_should_be_camelcase.severity = suggestion
dotnet_naming_rule.parameters_should_be_camelcase.symbols = parameters
dotnet_naming_rule.parameters_should_be_camelcase.style = camelcase
dotnet_naming_rule.public_fields_should_be_pascalcase.severity = suggestion
dotnet_naming_rule.public_fields_should_be_pascalcase.symbols = public_fields
dotnet_naming_rule.public_fields_should_be_pascalcase.style = pascalcase
dotnet_naming_rule.private_static_fields_should_be_s_camelcase.severity = suggestion
dotnet_naming_rule.private_static_fields_should_be_s_camelcase.symbols = private_static_fields
dotnet_naming_rule.private_static_fields_should_be_s_camelcase.style = s_camelcase
dotnet_naming_rule.public_constant_fields_should_be_pascalcase.severity = suggestion
dotnet_naming_rule.public_constant_fields_should_be_pascalcase.symbols = public_constant_fields
dotnet_naming_rule.public_constant_fields_should_be_pascalcase.style = pascalcase
dotnet_naming_rule.private_constant_fields_should_be_pascalcase.severity = suggestion
dotnet_naming_rule.private_constant_fields_should_be_pascalcase.symbols = private_constant_fields
dotnet_naming_rule.private_constant_fields_should_be_pascalcase.style = pascalcase
dotnet_naming_rule.public_static_readonly_fields_should_be_pascalcase.severity = suggestion
dotnet_naming_rule.public_static_readonly_fields_should_be_pascalcase.symbols = public_static_readonly_fields
dotnet_naming_rule.public_static_readonly_fields_should_be_pascalcase.style = pascalcase
dotnet_naming_rule.private_static_readonly_fields_should_be_pascalcase.severity = suggestion
dotnet_naming_rule.private_static_readonly_fields_should_be_pascalcase.symbols = private_static_readonly_fields
dotnet_naming_rule.private_static_readonly_fields_should_be_pascalcase.style = pascalcase
dotnet_naming_rule.enums_should_be_pascalcase.severity = suggestion
dotnet_naming_rule.enums_should_be_pascalcase.symbols = enums
dotnet_naming_rule.enums_should_be_pascalcase.style = pascalcase
dotnet_naming_rule.local_functions_should_be_pascalcase.severity = suggestion
dotnet_naming_rule.local_functions_should_be_pascalcase.symbols = local_functions
dotnet_naming_rule.local_functions_should_be_pascalcase.style = pascalcase
dotnet_naming_rule.non_field_members_should_be_pascalcase.severity = suggestion
dotnet_naming_rule.non_field_members_should_be_pascalcase.symbols = non_field_members
dotnet_naming_rule.non_field_members_should_be_pascalcase.style = pascalcase
dotnet_naming_rule.private_fields_should_be__camelcase.severity = suggestion
dotnet_naming_rule.private_fields_should_be__camelcase.symbols = private_fields
dotnet_naming_rule.private_fields_should_be__camelcase.style = _camelcase
# Symbol specifications
dotnet_naming_symbols.interfaces.applicable_kinds = interface
dotnet_naming_symbols.interfaces.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
dotnet_naming_symbols.interfaces.required_modifiers =
dotnet_naming_symbols.enums.applicable_kinds = enum
dotnet_naming_symbols.enums.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
dotnet_naming_symbols.enums.required_modifiers =
dotnet_naming_symbols.events.applicable_kinds = event
dotnet_naming_symbols.events.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
dotnet_naming_symbols.events.required_modifiers =
dotnet_naming_symbols.methods.applicable_kinds = method
dotnet_naming_symbols.methods.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
dotnet_naming_symbols.methods.required_modifiers =
dotnet_naming_symbols.properties.applicable_kinds = property
dotnet_naming_symbols.properties.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
dotnet_naming_symbols.properties.required_modifiers =
# Internal fields follow the private-field conventions, including modifier-specific exceptions.
dotnet_naming_symbols.public_fields.applicable_kinds = field
dotnet_naming_symbols.public_fields.applicable_accessibilities = public
dotnet_naming_symbols.public_fields.required_modifiers =
dotnet_naming_symbols.private_fields.applicable_kinds = field
dotnet_naming_symbols.private_fields.applicable_accessibilities = private, internal, protected, protected_internal, private_protected
dotnet_naming_symbols.private_fields.required_modifiers =
dotnet_naming_symbols.private_static_fields.applicable_kinds = field
dotnet_naming_symbols.private_static_fields.applicable_accessibilities = private, internal, protected, protected_internal, private_protected
dotnet_naming_symbols.private_static_fields.required_modifiers = static
dotnet_naming_symbols.types_and_namespaces.applicable_kinds = namespace, class, struct, interface, enum
dotnet_naming_symbols.types_and_namespaces.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
dotnet_naming_symbols.types_and_namespaces.required_modifiers =
dotnet_naming_symbols.non_field_members.applicable_kinds = property, event, method
dotnet_naming_symbols.non_field_members.applicable_accessibilities = public, internal, private, protected, protected_internal, private_protected
dotnet_naming_symbols.non_field_members.required_modifiers =
dotnet_naming_symbols.type_parameters.applicable_kinds = type_parameter
dotnet_naming_symbols.type_parameters.applicable_accessibilities = *
dotnet_naming_symbols.type_parameters.required_modifiers =
dotnet_naming_symbols.private_constant_fields.applicable_kinds = field
dotnet_naming_symbols.private_constant_fields.applicable_accessibilities = private, internal, protected, protected_internal, private_protected
dotnet_naming_symbols.private_constant_fields.required_modifiers = const
dotnet_naming_symbols.local_variables.applicable_kinds = local
dotnet_naming_symbols.local_variables.applicable_accessibilities = local
dotnet_naming_symbols.local_variables.required_modifiers =
dotnet_naming_symbols.local_constants.applicable_kinds = local
dotnet_naming_symbols.local_constants.applicable_accessibilities = local
dotnet_naming_symbols.local_constants.required_modifiers = const
dotnet_naming_symbols.parameters.applicable_kinds = parameter
dotnet_naming_symbols.parameters.applicable_accessibilities = *
dotnet_naming_symbols.parameters.required_modifiers =
dotnet_naming_symbols.public_constant_fields.applicable_kinds = field
dotnet_naming_symbols.public_constant_fields.applicable_accessibilities = public
dotnet_naming_symbols.public_constant_fields.required_modifiers = const
dotnet_naming_symbols.public_static_readonly_fields.applicable_kinds = field
dotnet_naming_symbols.public_static_readonly_fields.applicable_accessibilities = public
dotnet_naming_symbols.public_static_readonly_fields.required_modifiers = readonly, static
dotnet_naming_symbols.private_static_readonly_fields.applicable_kinds = field
dotnet_naming_symbols.private_static_readonly_fields.applicable_accessibilities = private, internal, protected, protected_internal, private_protected
dotnet_naming_symbols.private_static_readonly_fields.required_modifiers = readonly, static
dotnet_naming_symbols.local_functions.applicable_kinds = local_function
dotnet_naming_symbols.local_functions.applicable_accessibilities = *
dotnet_naming_symbols.local_functions.required_modifiers =
# Naming styles
dotnet_naming_style.pascalcase.required_prefix =
dotnet_naming_style.pascalcase.required_suffix =
dotnet_naming_style.pascalcase.word_separator =
dotnet_naming_style.pascalcase.capitalization = pascal_case
dotnet_naming_style.ipascalcase.required_prefix = I
dotnet_naming_style.ipascalcase.required_suffix =
dotnet_naming_style.ipascalcase.word_separator =
dotnet_naming_style.ipascalcase.capitalization = pascal_case
dotnet_naming_style.tpascalcase.required_prefix = T
dotnet_naming_style.tpascalcase.required_suffix =
dotnet_naming_style.tpascalcase.word_separator =
dotnet_naming_style.tpascalcase.capitalization = pascal_case
dotnet_naming_style._camelcase.required_prefix = _
dotnet_naming_style._camelcase.required_suffix =
dotnet_naming_style._camelcase.word_separator =
dotnet_naming_style._camelcase.capitalization = camel_case
dotnet_naming_style.camelcase.required_prefix =
dotnet_naming_style.camelcase.required_suffix =
dotnet_naming_style.camelcase.word_separator =
dotnet_naming_style.camelcase.capitalization = camel_case
dotnet_naming_style.s_camelcase.required_prefix = s_
dotnet_naming_style.s_camelcase.required_suffix =
dotnet_naming_style.s_camelcase.word_separator =
dotnet_naming_style.s_camelcase.capitalization = camel_case
.gitattributes
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###############################################################################
# Set default behavior to automatically normalize line endings.
###############################################################################
* text=auto encoding=UTF-8
# csc/vbc are shell scripts and should always have unix line endings
# These shell scripts are included in the toolset packages. Normally, the shell
# scripts in our repo are only run by cloning onto a Linux/Mac machine, and git
# automatically chooses LF as the line ending.
#
# However, right now the toolset packages must be built on Windows, and so the
# files must be hard-coded to be cloned with LF
src/Compilers/CSharp/CscCore/csc text eol=lf
src/Compilers/VisualBasic/VbcCore/vbc text eol=lf
###############################################################################
# Set default behavior for command prompt diff.
#
# This is need for earlier builds of msysgit that does not have it on by
# default for csharp files.
# Note: This is only used by command line
###############################################################################
*.cs diff=csharp text
*.vb text
###############################################################################
# Set the merge driver for project and solution files
#
# Merging from the command prompt will add diff markers to the files if there
# are conflicts (Merging from VS is not affected by the settings below, in VS
# the diff markers are never inserted). Diff markers may cause the following
# file extensions to fail to load in VS. An alternative would be to treat
# these files as binary and thus will always conflict and require user
# intervention with every merge. To do so, just uncomment the entries below
###############################################################################
#*.sln merge=binary
#*.csproj merge=binary
#*.vbproj merge=binary
#*.vcxproj merge=binary
#*.vcproj merge=binary
#*.dbproj merge=binary
#*.fsproj merge=binary
#*.lsproj merge=binary
#*.wixproj merge=binary
#*.modelproj merge=binary
#*.sqlproj merge=binary
#*.wwaproj merge=binary
###############################################################################
# behavior for image files
#
# image files are treated as binary by default.
###############################################################################
#*.jpg binary
#*.png binary
#*.gif binary
###############################################################################
# diff behavior for common document formats
#
# Convert binary document formats to text before diffing them. This feature
# is only available from the command line. Turn it on by uncommenting the
# entries below.
###############################################################################
#*.doc diff=astextplain
#*.DOC diff=astextplain
#*.docx diff=astextplain
#*.DOCX diff=astextplain
#*.dot diff=astextplain
#*.DOT diff=astextplain
#*.pdf diff=astextplain
#*.PDF diff=astextplain
#*.rtf diff=astextplain
#*.RTF diff=astextplain
.gitignore
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## Ignore Visual Studio temporary files, build results, and
## files generated by popular Visual Studio add-ons.
##
## Get latest from https://github.com/github/gitignore/blob/main/VisualStudio.gitignore
## Agent-specific files
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mono_crash.*
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[Ww][Ii][Nn]32/
[Aa][Rr][Mm]/
[Aa][Rr][Mm]64/
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[Bb]in/
[Oo]bj/
[Ll]og/
[Ll]ogs/
# Visual Studio 2015/2017 cache/options directory
.vs/
# Uncomment if you have tasks that create the project's static files in wwwroot
#wwwroot/
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Generated\ Files/
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# Note: Comment the next line if you want to checkin your web deploy settings,
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# JetBrains Rider
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Vendored
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{
"dotnet.defaultSolution": "Just.PreciseMath.slnx",
"dotnetAcquisitionExtension.enableTelemetry": false,
"dotnet.testWindow.useTestingPlatformProtocol": true
}
0-source/Directory.Build.props
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<Project>
<Import Project="../Directory.Build.props" />
<PropertyGroup>
<IsPackable>true</IsPackable>
<GenerateDocumentationFile>true</GenerateDocumentationFile>
<VersionPrefix>0.1.0</VersionPrefix>
<VersionSuffix>dev</VersionSuffix>
<Authors>JustFixMe</Authors>
<Copyright>Copyright (c) 2026 JustFixMe</Copyright>
<PackageTags>csharp;math;precise-math;</PackageTags>
<PackageLicenseFile>LICENSE</PackageLicenseFile>
<PackageReadmeFile>README.md</PackageReadmeFile>
<EmitCompilerGeneratedFiles Condition="'$(Configuration)'=='Debug'">true</EmitCompilerGeneratedFiles>
</PropertyGroup>
<ItemGroup>
<InternalsVisibleTo Include="$(AssemblyName).Tests" />
<InternalsVisibleTo Include="$(AssemblyName).Benchmarks" />
</ItemGroup>
<ItemGroup>
<None Include="$(MSBuildThisFileDirectory)../README.md" Pack="true" PackagePath="/" />
<None Include="$(MSBuildThisFileDirectory)../LICENSE" Pack="true" PackagePath="/" />
</ItemGroup>
</Project>
0-source/Just.PreciseMath/DoubleDouble.cs
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namespace Just.PreciseMath;
/// <summary>
/// Represents higher precision floating point type
/// </summary>
/// <remarks>
/// Constructs new DoubleDouble from given low and high components
/// </remarks>
public readonly struct DoubleDouble : IEquatable<DoubleDouble>, IEqualityOperators<DoubleDouble, DoubleDouble, bool>
{
internal readonly double _high;
internal readonly double _low;
// No normalization, for internal use only
internal DoubleDouble(double high, double low)
{
_high = high;
_low = low;
}
#region Static constants
/// <summary>
/// Represents a value that is not a number (NaN).
/// </summary>
public static DoubleDouble NaN => new(double.NaN, double.NaN);
/// <summary>
/// Represents a unit value.
/// </summary>
public static DoubleDouble One => new(1.0, 0);
/// <summary>
/// Represents a zero value.
/// </summary>
public static DoubleDouble Zero => new();
#endregion
/// <summary>
/// High part of DoubleDouble
/// </summary>
public readonly double High => _high;
/// <summary>
/// Low part of DoubleDouble
/// </summary>
public readonly double Low => _low;
/// <inheritdoc/>
[Pure]
public bool Equals(DoubleDouble other) => _high == other._high && _low == other._low;
/// <inheritdoc/>
[Pure]
public override bool Equals(object? obj) => obj is DoubleDouble other && this.Equals(other);
/// <inheritdoc/>
[Pure]
public override int GetHashCode() => HashCode.Combine(_high, _low);
/// <summary>
/// TODO: fill
/// </summary>
[Pure, MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool operator ==(DoubleDouble left, DoubleDouble right) => left.Equals(right);
/// <summary>
/// TODO: fill
/// </summary>
[Pure, MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool operator !=(DoubleDouble left, DoubleDouble right) => !left.Equals(right);
}
0-source/Just.PreciseMath/Just.PreciseMath.csproj
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<AssemblyName>Just.PreciseMath</AssemblyName>
<RootNamespace>Just.PreciseMath</RootNamespace>
<Description>A .NET library for extended-precision floating-point arithmetic using double-double representations and common mathematical functions.</Description>
</PropertyGroup>
<ItemGroup>
<Using Include="System.Numerics"/>
<Using Include="System.Diagnostics.Contracts"/>
<Using Include="System.Runtime.CompilerServices"/>
</ItemGroup>
</Project>
1-tests/Directory.Build.props
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<Project>
<Import Project="../Directory.Build.props" />
<PropertyGroup>
<OutputType>Exe</OutputType>
<IsPackable>false</IsPackable>
<IsTestProject>true</IsTestProject>
<UseMicrosoftTestingPlatformRunner>true</UseMicrosoftTestingPlatformRunner>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Shouldly" Version="4.3.0" />
<PackageReference Include="xunit.v3" Version="4.0.1" />
<PackageReference Include="coverlet.MTP" Version="10.0.1">
<PrivateAssets>all</PrivateAssets>
</PackageReference>
</ItemGroup>
</Project>
1-tests/Just.PreciseMath.Tests/Just.PreciseMath.Tests.csproj
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<AssemblyName>Just.PreciseMath.Tests</AssemblyName>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="../../0-source/Just.PreciseMath/Just.PreciseMath.csproj" />
</ItemGroup>
</Project>
2-benchmarks/Directory.Build.props
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<Project>
<Import Project="../Directory.Build.props" />
<PropertyGroup>
<IsPackable>false</IsPackable>
<IsTestProject>false</IsTestProject>
</PropertyGroup>
</Project>
2-benchmarks/Just.PreciseMath.Benchmarks/Just.PreciseMath.Benchmarks.csproj
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<AssemblyName>Just.PreciseMath.Benchmarks</AssemblyName>
<RootNamespace>Just.PreciseMath.Benchmarks</RootNamespace>
<Description>BenchmarkDotNet scaffold for measuring Just.PreciseMath arithmetic and mathematical functions.</Description>
<!-- Source-free scaffold: change to Exe when adding the benchmark entry point. -->
<OutputType>Library</OutputType>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="BenchmarkDotNet" Version="0.15.8" />
<ProjectReference Include="../../0-source/Just.PreciseMath/Just.PreciseMath.csproj" />
</ItemGroup>
</Project>
Directory.Build.props
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<Project>
<PropertyGroup>
<TargetFramework>net10.0</TargetFramework>
<LangVersion>14.0</LangVersion>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
<EnableNETAnalyzers>true</EnableNETAnalyzers>
<AnalysisLevel>10.0-recommended</AnalysisLevel>
<EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
<RunAnalyzersDuringBuild>true</RunAnalyzersDuringBuild>
<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
<Deterministic>true</Deterministic>
<DebugType>portable</DebugType>
<ContinuousIntegrationBuild Condition="'$(CI)' == 'true'">true</ContinuousIntegrationBuild>
<NuGetAudit>true</NuGetAudit>
<NuGetAuditMode>all</NuGetAuditMode>
</PropertyGroup>
</Project>
Just.PreciseMath.slnx
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<Solution>
<Folder Name="/0-source/">
<Project Path="0-source/Just.PreciseMath/Just.PreciseMath.csproj" />
</Folder>
<Folder Name="/1-tests/">
<Project Path="1-tests/Just.PreciseMath.Tests/Just.PreciseMath.Tests.csproj" />
</Folder>
<Folder Name="/2-benchmarks/">
<Project Path="2-benchmarks/Just.PreciseMath.Benchmarks/Just.PreciseMath.Benchmarks.csproj" />
</Folder>
</Solution>
LICENSE
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Copyright (c) 2026 JustFixMe
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
README.md
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# Just.PreciseMath
**WIP — repository scaffolding only; no library implementation or tests yet.**
A .NET 10 library being developed for extended-precision floating-point arithmetic
using double-double representations (a high/low pair of `double` values), with
common mathematical functions. This is fixed extended precision, not arbitrary
precision; accuracy guarantees and the public API are not settled.
## Planned scope
- Double-double arithmetic, constants, comparisons, conversions, and formatting.
- Common functions including `Abs`, `Sqrt`, `Pow`, `Exp`, and `Log`.
- Correctness tests against higher-precision references and performance benchmarks.
The [consolidated legacy review](review-legacy/Review-Revisited-DoubleDouble.md)
is the starting point. Priorities are normalization and special-value contracts
(NaN, infinities, signed zero), corrected constants and scalar subtraction,
consistent comparisons, precision-preserving conversions/formatting, and
range-safe arithmetic and transcendental functions, including cancellation and
subnormal cases. The files in `review-legacy/` contain known defects: they are
reference material only, are not compiled, and should not be used in production.
## Layout
- `0-source/Just.PreciseMath/` — library and package metadata.
- `1-tests/Just.PreciseMath.Tests/` — xUnit v3, Shouldly, and MTP-native Coverlet.
- `2-benchmarks/Just.PreciseMath.Benchmarks/` — BenchmarkDotNet scaffold.
- `review-legacy/` — original implementation and numerical reviews.
## Development
Use the .NET 10 SDK selected by `global.json` (10.0.1xx, latest installed patch).
Shared settings enable nullable analysis, .NET 10 recommended analyzers, build-time
code-style checks, and warnings as errors. `.editorconfig` retains advisory style
preferences alongside explicitly enforced warning/error rules.
```sh
dotnet restore Just.PreciseMath.slnx
dotnet build Just.PreciseMath.slnx -c Release --no-restore
dotnet test --solution Just.PreciseMath.slnx -c Release --no-build
dotnet format Just.PreciseMath.slnx --verify-no-changes --no-restore
```
The empty test project currently reports no tests (MTP exit code 8); this is not a
passing test suite. Once tests exist, add `--coverlet` to the test command for
coverage. The benchmark project deliberately builds as a library without source
files; add an entry point and benchmark cases, then change `OutputType` to `Exe`
and run it in Release without a debugger. No performance results exist yet.
Package metadata uses the development version `0.1.0-dev`. Licensed under the
[MIT License](LICENSE), included in the package.
Do not publish this scaffold as a usable numerical library.
global.json
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{
"sdk": {
"version": "10.0.100",
"rollForward": "latestPatch",
"allowPrerelease": false
},
"test": {
"runner": "Microsoft.Testing.Platform"
}
}