File: mantemp.el.html

This file is obsolete. For more information, see: https://debbugs.gnu.org/34789

The following is a typical error message from g++ using STL (here with split lines):

AFile.o(.text+0x2d5): undefined reference to
  vector<double>::begin(void)
AFile.o(.text+0x2e7): undefined reference to
  vector<double>::insert(double *, unsigned int, double const &)
AnotherFile.o(.text+0x226b8): undefined reference to
  operator!=(rb_tree<basic_string<char>, pair<basic_string<char>
  const, AClass *>, select1st<pair<basic_string<char> const, AClass
  *>, basic_string<char> >, less<basic_string<char> > >::iterator
  const &, rb_tree<basic_string<char>, pair<basic_string<char>
  const, AClass *>, select1st<pair<basic_string<char> const, AClass
  *>, basic_string<char> >, less<basic_string<char> > >::iterator
  const &)

The message means that in the object file AFile.o there is one uninstantiated template class, vector<double>, and in AnotherFile.o there is one uninstantiated template function, operator!=(...). To turn this output into manual template instantiations, copy from the first name of an objective file (here this is AFile.o) to right after the very last ' of the output. Put this in a buffer and call mantemp-make-mantemps-buffer with the point in the buffer. You can also use mantemp-make-mantemps-region directly on the region if the output is already in Emacs.

The resulting buffer yields (connect the three output lines above if you want to try):

template operator!=(rb_tree<basic_string<char>,
  pair<basic_string<char> const, AClass *>,
  select1st<pair<basic_string<char> const, AClass *>,
  basic_string<char> >, less<basic_string<char> > >::iterator const
  &, rb_tree<basic_string<char>, pair<basic_string<char> const,
  AClass *>, select1st<pair<basic_string<char> const, AClass *>,
  basic_string<char> >, less<basic_string<char> > >::iterator const
  &);
template class vector<double>;

which can be included in your C++ program. However, its probably better to include the necessary header files in the buffer and compile it as a stand alone implementation file.

Sometimes, an uninstantiated template may cause a message like the following

main.cc:66: invalid use of undefined type
  struct valarray<double,arrayminusopclass<double,c_array<double> > >

Follow the same procedure as above and the line is changed to

template struct valarray<double,
  arrayminusopclass<double,c_array<double> > >;

g++ does not output the templates that are needed by the uninstantiated templates. Therefore you will often get new error messages after the first instantiations have been included and you must repeat the operation.

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Defined functions (7)

Defined faces (0)