RE: [Vxl-users] template depth problem

[Miller, J. V (Research) <mil...@cr...>]

It is remarkably easy to exceed the "template depth limit".

Things that can be included in the "template depth"

* Template parameters that are themselves templates (dependent template parameters etc)
* Nested classes that use template parameters
* Ivars that use template template parameters

The third one is particularly insipid.  For instance, I think gcc would consider

template <class T>
class A
{
	B<T> b;
	C<T> c;
	D<T> d;
}

to have a template depth of at least 4 (each templated ivar is considered one depth).

The easiest thing to do is crank up the depth limit.




> -----Original Message-----
> From: Dav...@st...
> [mailto:Dav...@st...]
> Sent: Tuesday, September 17, 2002 10:18 AM
> To: vxl...@li...
> Subject: [Vxl-users] template depth problem
> 
> 
> Dear VXL person,
> 
> I get the following error report when trying to build my cxx 
> code under linux. This problem doesn't
> occur under windows.
> 
> I don't think my code contains "17 levels of template 
> instantiations" as indicated in the actual
> error message.
> 
> Do any gcc experts know what causes this error?
> 
> Many thanks
> 
> David
> 
> 
> File: vxlsrc/vxl/vnl/vnl_vector.h Line: 118CVS
> 
> c++ -rdynamic  build_point_predictor.o  
> -L/work/dart/vxlbin/lib -L/work/dart/contbin/lib -lohf
> -ladab -lvaam -lapmvfy -lohf -lfpf -llfr -lclsfy -lvaxm 
> -lvapm -lvtri -lvsml -lwvlt -lvul_io -lvul
> -lvpl -lvpdfl -lmil_algo -lmil -lvil -lz -ltiff -lpng -ljpeg 
> -lvbl_io -lvbl -lmbl -lvnl_io
> -lvnl_algo -lvnl -lnetlib -lvgl_io -lvsl -lvgl -lvcl -lm
> -Wl,-rpath,/work/dart/vxlbin/lib:/work/dart/contbin/lib  -o 
> build_point_predictor
> c++ -rdynamic  evaluate_edge_searcher_base_roc.o  
> -L/work/dart/vxlbin/lib -L/work/dart/contbin/lib
> -lohf -ladab -lvaam -lapmvfy -lohf -lfpf -llfr -lclsfy -lvaxm 
> -lvapm -lvtri -lvsml -lwvlt -lvul_io
> -lvul -lvpl -lvpdfl -lmil_algo -lmil -lvil -lz -ltiff -lpng 
> -ljpeg -lvbl_io -lvbl -lmbl -lvnl_io
> -lvnl_algo -lvnl -lnetlib -lvgl_io -lvsl -lvgl -lvcl -lm
> -Wl,-rpath,/work/dart/vxlbin/lib:/work/dart/contbin/lib  -o 
> evaluate_edge_searcher_base_roc
> /work/dart/contbin/isbe_genhyp/gapi: building default_target
> /work/dart/contbin/isbe_genhyp/fmc: building default_target
> c++  -Dfmc_EXPORTS -fPIC -I/work/dart/contsrc/isbe_genhyp/fmc 
> -I/work/dart/vxlbin/vcl
> -I/work/dart/vxlbin/vxl -I/work/dart/vxlsrc/vcl 
> -I/work/dart/vxlsrc/vxl -I/work/dart/vxlsrc/mul
> -I/work/dart/contsrc/isbe_apm 
> -I/work/dart/contsrc/isbe_genhyp   -DVXL_WARN_DEPRECATED
> -DVXL_WARN_DEPRECATED_ONCE -c
> /work/dart/contsrc/isbe_genhyp/fmc/Templates/vsl_vector_io+vcl
> _vector_vcl_vector_vnl_vector~-.cxx -o
> Templates/vsl_vector_io+vcl_vector_vcl_vector_vnl_vector~-.o
> /work/dart/vxlsrc/vxl/vnl/vnl_vector.h: In method 
> `vnl_vector<double>::~vnl_vector()':
> /work/dart/vxlsrc/vxl/vnl/vnl_vector.h:118: template 
> instantiation depth exceeds maximum of 17
> /work/dart/vxlsrc/vxl/vnl/vnl_vector.h:118:  (use 
> -ftemplate-depth-NN to increase the maximum)
> /work/dart/vxlsrc/vxl/vnl/vnl_vector.h:118:   instantiating 
> `vnl_vector<double>::destroy()'
> /work/dart/vxlsrc/vxl/vnl/vnl_vector.h:118:   instantiated 
> from `vnl_vector<double>::~vnl_vector()'
> /usr/include/g++/stl_construct.h:43:   instantiated from 
> `destroy<vnl_vector<double>
> >(vnl_vector<double> *)'
> /usr/include/g++/stl_construct.h:61:   instantiated from 
> `__destroy_aux<vnl_vector<double>
> *>(vnl_vector<double> *, vnl_vector<double> *, __false_type)'
> /usr/include/g++/stl_construct.h:73:   instantiated from 
> `__destroy<vnl_vector<double> *,
> vnl_vector<double> >(vnl_vector<double> *, vnl_vector<double> 
> *, vnl_vector<double> *)'
> 
> 
> 
> 
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