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ii.23.2.7-custommod.md

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II.23.2.7 CustomMod

The CustomMod (custom modifier) item in Signatures has a syntax diagram like this:

This diagram uses the following abbreviations:

  • CMOD_OPT for ELEMENT_TYPE_CMOD_OPT (§II.23.1.16)

  • CMOD_REQD for ELEMENT_TYPE_CMOD_REQD (§II.23.1.16)

The CMOD_OPT or CMOD_REQD value is compressed, see §II.23.2.

The CMOD_OPT or CMOD_REQD is followed by a metadata token that indexes a row in the TypeDef table or the TypeRef table. However, these tokens are encoded and compressed – see §II.23.2.8 for details

If the CustomModifier is tagged CMOD_OPT, then any importing compiler can freely ignore it entirely. Conversely, if the CustomModifier is tagged CMOD_REQD, any importing compiler shall 'understand' the semantic implied by this CustomModifier in order to reference the surrounding Signature.