36 lines
11 KiB
HTML
36 lines
11 KiB
HTML
<html><head><meta http-equiv="X-UA-Compatible" content="IE=edge" /><link rel="shortcut icon" href="../icons/favicon.ico" /><link rel="stylesheet" type="text/css" href="../styles/branding.css" /><link rel="stylesheet" type="text/css" href="../styles/branding-en-US.css" /><script type="text/javascript" src="../scripts/branding.js"> </script><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>mp_base._mp_d Property </title><meta name="Language" content="en-us" /><meta name="System.Keywords" content="_mp_d property" /><meta name="System.Keywords" content="mp_base._mp_d property" /><meta name="Microsoft.Help.F1" content="Math.Gmp.Native.mp_base._mp_d" /><meta name="Microsoft.Help.F1" content="Math.Gmp.Native.mp_base.get__mp_d" /><meta name="Microsoft.Help.Id" content="P:Math.Gmp.Native.mp_base._mp_d" /><meta name="Description" content="A pointer to an array of limbs which is the magnitude." /><meta name="Microsoft.Help.ContentType" content="Reference" /><meta name="BrandingAware" content="true" /><meta name="container" content="Math.Gmp.Native" /><meta name="file" content="db55f1a9-cd4c-b7e9-c831-4391c0497ef7" /><meta name="guid" content="db55f1a9-cd4c-b7e9-c831-4391c0497ef7" /><link rel="stylesheet" type="text/css" href="../styles/branding-Website.css" /><script type="text/javascript" src="../scripts/jquery-1.11.0.min.js"></script><script type="text/javascript" src="../scripts/branding-Website.js"></script><script type="text/javascript" src="../scripts/clipboard.min.js"></script></head><body onload="OnLoad('cs')"><input type="hidden" id="userDataCache" class="userDataStyle" /><div class="pageHeader" id="PageHeader">GMP Native Interface for .NET<form id="SearchForm" method="get" action="#" onsubmit="javascript:TransferToSearchPage(); return false;"><input id="SearchTextBox" type="text" maxlength="200" /><button id="SearchButton" type="submit"></button></form></div><div class="pageBody"><div class="leftNav" id="leftNav"><div id="tocNav"><div class="toclevel0" data-toclevel="0"><a class="tocCollapsed" onclick="javascript: Toggle(this);" href="#!" /><a data-tochassubtree="true" href="846f5c8a-6cba-433e-9f18-cde2ff5695cd.htm" title="GMP Native Interface for .NET" tocid="roottoc">GMP Native Interface for .NET</a></div><div class="toclevel0" data-toclevel="0"><a class="tocCollapsed" onclick="javascript: Toggle(this);" href="#!" /><a data-tochassubtree="true" href="d9c51b9f-0c54-770b-28ea-6eebd8fef368.htm" title="Math.Gmp.Native" tocid="d9c51b9f-0c54-770b-28ea-6eebd8fef368">Math.Gmp.Native</a></div><div class="toclevel0" data-toclevel="0"><a class="tocCollapsed" onclick="javascript: Toggle(this);" href="#!" /><a data-tochassubtree="true" href="8f3c572b-8133-bccc-b838-9d22e3467898.htm" title="mp_base Class" tocid="8f3c572b-8133-bccc-b838-9d22e3467898">mp_base Class</a></div><div class="toclevel1" data-toclevel="1" data-childrenloaded="true"><a class="tocExpanded" onclick="javascript: Toggle(this);" href="#!" /><a data-tochassubtree="true" href="c65a20b0-ddd8-db62-1d34-19bf1a71ce8c.htm" title="mp_base Properties" tocid="c65a20b0-ddd8-db62-1d34-19bf1a71ce8c">mp_base Properties</a></div><div class="toclevel2 current" data-toclevel="2"><a data-tochassubtree="false" href="db55f1a9-cd4c-b7e9-c831-4391c0497ef7.htm" title="_mp_d Property " tocid="db55f1a9-cd4c-b7e9-c831-4391c0497ef7">_mp_d Property </a></div><div class="toclevel2" data-toclevel="2"><a data-tochassubtree="false" href="01baafdb-caf3-5653-428f-0ba9c42c3a9a.htm" title="_mp_d_intptr Property " tocid="01baafdb-caf3-5653-428f-0ba9c42c3a9a">_mp_d_intptr Property </a></div><div class="toclevel2" data-toclevel="2"><a data-tochassubtree="false" href="178d8d44-2485-2972-fe2f-eb9848059e6f.htm" title="_mp_size Property " tocid="178d8d44-2485-2972-fe2f-eb9848059e6f">_mp_size Property </a></div></div><div id="tocResizableEW" onmousedown="OnMouseDown(event);"></div><div id="TocResize" class="tocResize"><img id="ResizeImageIncrease" src="../icons/TocOpen.gif" onclick="OnIncreaseToc()" alt="Click or drag to resize" title="Click or drag to resize" /><img id="ResizeImageReset" src="../icons/TocClose.gif" style="display:none" onclick="OnResetToc()" alt="Click or drag to resize" title="Click or drag to resize" /></div></div><div class="topicContent" id="TopicContent"><table class="titleTable"><tr><td class="titleColumn">mp_base<span id="LST71A5CF0F_0"></span><script type="text/javascript">AddLanguageSpecificTextSet("LST71A5CF0F_0?cpp=::|nu=.");</script>_mp_d Property </td></tr></table><span class="introStyle"></span> <div class="summary">
|
||
A pointer to an array of limbs which is the magnitude.
|
||
</div><p> </p>
|
||
<strong>Namespace:</strong>
|
||
<a href="d9c51b9f-0c54-770b-28ea-6eebd8fef368.htm">Math.Gmp.Native</a><br />
|
||
<strong>Assembly:</strong>
|
||
Math.Gmp.Native (in Math.Gmp.Native.dll) Version: 1.0.0.0 (1.0.0.0)<div class="collapsibleAreaRegion"><span class="collapsibleRegionTitle" onclick="SectionExpandCollapse('ID1RB')" onkeypress="SectionExpandCollapse_CheckKey('ID1RB', event)" tabindex="0"><img id="ID1RBToggle" class="collapseToggle" src="../icons/SectionExpanded.png" />Syntax</span></div><div id="ID1RBSection" class="collapsibleSection"><div class="codeSnippetContainer"><div class="codeSnippetContainerTabs"><div id="ID0EDCA_tab1" class="codeSnippetContainerTab"><a href="#" onclick="javascript:ChangeTab('ID0EDCA','cs','1','4');return false;">C#</a></div><div id="ID0EDCA_tab2" class="codeSnippetContainerTab"><a href="#" onclick="javascript:ChangeTab('ID0EDCA','vb','2','4');return false;">VB</a></div><div id="ID0EDCA_tab3" class="codeSnippetContainerTab"><a href="#" onclick="javascript:ChangeTab('ID0EDCA','cpp','3','4');return false;">C++</a></div><div id="ID0EDCA_tab4" class="codeSnippetContainerTab"><a href="#" onclick="javascript:ChangeTab('ID0EDCA','fs','4','4');return false;">F#</a></div></div><div class="codeSnippetContainerCodeContainer"><div class="codeSnippetToolBar"><div class="codeSnippetToolBarText"><a id="ID0EDCA_copyCode" href="#" class="copyCodeSnippet" onclick="javascript:CopyToClipboard('ID0EDCA');return false;" title="Copy">Copy</a></div></div><div id="ID0EDCA_code_Div1" class="codeSnippetContainerCode" style="display: block"><pre xml:space="preserve"><span class="keyword">public</span> <span class="keyword">virtual</span> <span class="identifier">mp_ptr</span> <span class="identifier">_mp_d</span> { <span class="keyword">get</span>; }</pre></div><div id="ID0EDCA_code_Div2" class="codeSnippetContainerCode" style="display: none"><pre xml:space="preserve"><span class="keyword">Public</span> <span class="keyword">Overridable</span> <span class="keyword">ReadOnly</span> <span class="keyword">Property</span> <span class="identifier">_mp_d</span> <span class="keyword">As</span> <span class="identifier">mp_ptr</span>
|
||
<span class="keyword">Get</span></pre></div><div id="ID0EDCA_code_Div3" class="codeSnippetContainerCode" style="display: none"><pre xml:space="preserve"><span class="keyword">public</span>:
|
||
<span class="keyword">virtual</span> <span class="keyword">property</span> <span class="identifier">mp_ptr</span>^ <span class="identifier">_mp_d</span> {
|
||
<span class="identifier">mp_ptr</span>^ <span class="keyword">get</span> ();
|
||
}</pre></div><div id="ID0EDCA_code_Div4" class="codeSnippetContainerCode" style="display: none"><pre xml:space="preserve"><span class="keyword">abstract</span> <span class="identifier">_mp_d</span> : <span class="identifier">mp_ptr</span> <span class="keyword">with</span> <span class="keyword">get</span>
|
||
<span class="keyword">override</span> <span class="identifier">_mp_d</span> : <span class="identifier">mp_ptr</span> <span class="keyword">with</span> <span class="keyword">get</span></pre></div></div></div><script type="text/javascript">AddLanguageTabSet("ID0EDCA");</script><h4 class="subHeading">Property Value</h4>Type: <a href="4609ac5e-5cf9-cd20-2fa9-8040101c165c.htm">mp_ptr</a></div><div class="collapsibleAreaRegion"><span class="collapsibleRegionTitle" onclick="SectionExpandCollapse('ID2RB')" onkeypress="SectionExpandCollapse_CheckKey('ID2RB', event)" tabindex="0"><img id="ID2RBToggle" class="collapseToggle" src="../icons/SectionExpanded.png" />Remarks</span></div><div id="ID2RBSection" class="collapsibleSection"><p>
|
||
In <a href="8beda7fb-bbc4-b56f-fd1f-1459377ecb3b.htm">mpz_t</a>:
|
||
</p><p>
|
||
A pointer to an array of limbs which is the magnitude.
|
||
These are stored “little endian” as per the mpn functions, so <span class="code"><span class="selflink">_mp_d</span>[0]</span>
|
||
is the least significant limb and <span class="code"><span class="selflink">_mp_d</span>[ABS(<a href="178d8d44-2485-2972-fe2f-eb9848059e6f.htm">_mp_size</a>) - 1]</span>
|
||
is the most significant.
|
||
Whenever <a href="178d8d44-2485-2972-fe2f-eb9848059e6f.htm">_mp_size</a> is non-zero, the most significant limb is non-zero.
|
||
</p><p>
|
||
Currently there’s always at least one limb allocated, so for instance <a href="7daadb71-9f36-2848-86c4-ba1fba25fcfd.htm">gmp_lib.mpz_set_ui</a>
|
||
never needs to reallocate, and <a href="3a92eddc-59f3-b42f-9921-4e1cc5700d60.htm">gmp_lib.mpz_get_ui</a> can fetch <span class="code"><span class="selflink">_mp_d</span>[0]</span>
|
||
unconditionally (though its value is then only wanted if <a href="178d8d44-2485-2972-fe2f-eb9848059e6f.htm">_mp_size</a> is non-zero).
|
||
</p><p>
|
||
In <a href="8beda7fb-bbc4-b56f-fd1f-1459377ecb3b.htm">mpz_t</a>:
|
||
</p><p>
|
||
A pointer to the array of limbs which is the absolute value of the mantissa.
|
||
These are stored "little endian" as per the <span class="code">mpn</span> functions, so <span class="code">_mp_d[0]</span> is the least
|
||
significant limb and <span class="code">_mp_d[ABS(_mp_size)-1]</span> the most significant.
|
||
</p><p>
|
||
The most significant limb is always non-zero, but there are no other restrictions on its value,
|
||
in particular the highest <span class="code">1</span> bit can be anywhere within the limb.
|
||
</p><p><span class="code">_mp_prec + 1</span> limbs are allocated to <span class="selflink">mp_base._mp_d</span>, the extra limb being for
|
||
convenience (see below).
|
||
There are no reallocations during a calculation, only in a change of precision with <a href="438e6843-fc7b-4e6f-9ac0-d97a2773b032.htm">gmp_lib.mpf_set_prec</a>.
|
||
</p></div><div class="collapsibleAreaRegion" id="seeAlsoSection"><span class="collapsibleRegionTitle" onclick="SectionExpandCollapse('ID3RB')" onkeypress="SectionExpandCollapse_CheckKey('ID3RB', event)" tabindex="0"><img id="ID3RBToggle" class="collapseToggle" src="../icons/SectionExpanded.png" />See Also</span></div><div id="ID3RBSection" class="collapsibleSection"><h4 class="subHeading">Reference</h4><div class="seeAlsoStyle"><a href="8f3c572b-8133-bccc-b838-9d22e3467898.htm">mp_base Class</a></div><div class="seeAlsoStyle"><a href="d9c51b9f-0c54-770b-28ea-6eebd8fef368.htm">Math.Gmp.Native Namespace</a></div></div></div></div><div id="pageFooter" class="pageFooter"> </div></body></html> |