eigen/debug/msvc/eigen.natvis

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      <Expand>
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          <ValuePointer>m_storage.m_data.array</ValuePointer>
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        <ArrayItems Condition="!(Flags%2)"> <!-- column major layout -->
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          <Size>$i==0 ? $T2 : $T3</Size>
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  <!-- 2 x 2 Matrix -->
  <Type Name="Eigen::Matrix&lt;*,2,2,*,*,*&gt;">      
      <AlternativeType Name="Eigen::Array&lt;*,2,2,*,*,*&gt;"/>
      <DisplayString>[2, 2] (fixed matrix)</DisplayString>
      <Expand>
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  <!-- 3 x 3 Matrix -->
  <Type Name="Eigen::Matrix&lt;*,3,3,*,*,*&gt;">      
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      <DisplayString>[3, 3] (fixed matrix)</DisplayString>
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  <!-- 4 x 4 Matrix -->
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  <!-- Dynamic x Dynamic Matrix -->
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      <Expand>
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  <!-- Fixed x Dynamic Matrix -->
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  <!-- Dynamic x Fixed Matrix -->
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  <!-- Dynamic Column Vector -->
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          <Size>m_storage.m_cols</Size>
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  <!-- Dynamic Row Vector -->
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      <AlternativeType Name="Eigen::Array&lt;*,-1,1,*,*,*&gt;"/>
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  <!-- Fixed Vector -->
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    <Type Name="Eigen::Matrix&lt;*,4,1,*,*,*&gt;">
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