I'm trying to write a perl wrapper for my C++ library. My whole library is under a namespace: 
namespace geno_eye
{
typedef int64_t PosType;
}

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I wrote the following typemap, in which T_IV is a perl build-in typemap: 
TYPEMAP
geno_eye::PosType    T_IV

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and I wrote the following XS code: 
....

MODULE = GenoEye        PACKAGE = GenoEye::Page

geno_eye::Page*
Page::new(format, file, width, height, genome_display_length)
    SV* format
    SV* file
    double width
    double height
    geno_eye::PosType genome_display_length
    CODE:

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It seems xsubpp converts ":" into "_": 
GenoEye.c:196:2: error: ‘geno_eye__PosType’ was not declared in this s
+cope
  geno_eye__PosType genome_display_length = (geno_eye__PosType)SvIV(ST
+(5))

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How to work around it?

In reply to XS cannot properly handle typemap with namespace by llancet

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