GSL/GSL.natvis

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<!-- 
    This will make GitHub and some editors recognize this code as XML: 
    vim: syntax=xml
-->
<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
    <!-- These types are from the gsl_assert header. -->
    <Type Name="gsl::fail_fast">
        <!-- na hides the address, otherwise it would appear as 0x.... "Message" -->
        <DisplayString>{_Data._What,nasb}</DisplayString>
    </Type>

    <!-- These types are from the gsl_util header. -->
    <Type Name="gsl::final_act&lt;*&gt;">
        <DisplayString>{{ invoke = {invoke_}, action = {f_} }}</DisplayString>
        <Expand>
            <Item Name="[invoke]">invoke_</Item>
            <Item Name="[callback]">f_</Item>
        </Expand>
    </Type>

    <!-- These types are from the span header. -->
    <!-- This is for dynamic_extent spans. -->
    <Type Name="gsl::span&lt;*, -1&gt;">
        <DisplayString>{{ extent = {storage_.size_} }}</DisplayString>
        <Expand>
            <ArrayItems>
                <Size>storage_.size_</Size>
                <ValuePointer>storage_.data_</ValuePointer>
            </ArrayItems>
        </Expand>
    </Type>

    <!-- This works for constexpr size spans. -->
    <Type Name="gsl::span&lt;*, *&gt;">
        <DisplayString>{{ extent = {extent} }}</DisplayString>
        <Expand>
            <ArrayItems>
                <Size>extent</Size>
                <ValuePointer>storage_.data_</ValuePointer>
            </ArrayItems>
        </Expand>
    </Type>

    <!-- This is for dynamic_extent string_spans. -->
    <Type Name="gsl::basic_string_span&lt;*, -1&gt;">
        <DisplayString>{span_.storage_.data_,[span_.storage_.size_]na}</DisplayString>
        <Expand>
            <Item Name="[size]">span_.storage_.size_</Item>
            <ArrayItems>
                <Size>span_.storage_.size_</Size>
                <ValuePointer>span_.storage_.data_</ValuePointer>
            </ArrayItems>
        </Expand>
    </Type>

    <!-- This works for constexpr size string_spans. -->
    <Type Name="gsl::basic_string_span&lt;*, *&gt;">
        <DisplayString>{span_.storage_.data_,[span_.extent]na}</DisplayString>
        <Expand>
            <Item Name="[size]">span_.extent</Item>
            <ArrayItems>
                <Size>span_.extent</Size>
                <ValuePointer>span_.storage_.data_</ValuePointer>
            </ArrayItems>
        </Expand>
    </Type>

    <!-- This is for dynamic_extent zstring_spans. -->
    <Type Name="gsl::basic_zstring_span&lt;*, -1&gt;">
        <DisplayString>{span_.storage_.data_,[span_.storage_.size_]na}</DisplayString>
        <Expand>
            <Item Name="[size]">span_.storage_.size_</Item>
            <ArrayItems>
                <Size>span_.storage_.size_</Size>
                <ValuePointer>span_.storage_.data_</ValuePointer>
            </ArrayItems>
        </Expand>
    </Type>
    
    <!-- This works for constexpr size string_spans. -->
    <Type Name="gsl::basic_zstring_span&lt;*, *&gt;">
        <DisplayString>{span_.storage_.data_,[span_.extent]na}</DisplayString>
        <Expand>
            <Item Name="[size]">span_.extent</Item>
            <ArrayItems>
                <Size>span_.extent</Size>
                <ValuePointer>span_.storage_.data_</ValuePointer>
            </ArrayItems>
        </Expand>
    </Type>
    
    <!-- These types are from the gsl header. -->
    <Type Name="gsl::not_null&lt;*&gt;">
        <!-- We can always dereference this since it's an invariant. -->
        <DisplayString>value = {*ptr_}</DisplayString>
    </Type>
</AutoVisualizer>