dolfin team mailing list archive

["Garth N. Wells" <g.n.wells@xxxxxxxxxx>]

I can't give a definitive answer on whether or not anonymous classes are
part of ISO C++, but it does seem that this is a gcc 3.3 bug which has
been fixed in gcc >= 3.4 (http://gcc.gnu.org/gcc-3.4/changes.html).

I don't think that it's unreasonable that DOLFIN require gcc >= 3.4, so
we can keeps things as they are.

Garth


On Thu, 2006-03-23 at 13:46 -0600, Anders Logg wrote:
> It depends on how old the compilers are that can't handle it...
> 
> But if it's not in the standard then we should avoid it. Do you know
> if anonymous classes are allowed in ISO C++?
> 
> /Anders
> 
> 
> On Thu, Mar 23, 2006 at 08:10:48PM +0100, Nguyen Tien Dung wrote:
> 
> > By changing to standard definitions like that, it works. Do you think we 
> > should keep ISO forms when writing new versions, so that both old and new 
> > compilers can be used?
> > 
> > 
> > Quoting Anders Logg <logg@xxxxxxxxx>:
> > 
> > > My interpretation is that your gcc complains the about use of
> > > anonymous classes:
> > > 
> > > Does it help if you change in the three places in
> > > src/demo/pde/convection-diffusion/main.cpp where this is used?
> > > 
> > > Change from
> > > 
> > >     class : public Function
> > >     {
> > >         ...
> > >     } f;
> > > 
> > > to
> > > 
> > >     class MyFunction : public Function
> > >     {
> > >         ...
> > >     };
> > > 
> > >     MyFunction f;
> > > 
> > > and similarly for the two BoundaryConditions.
> > > 
> > > Does anyone know if 'class : public Foo { } foo;' is not allowed in
> > > ANSI C++? I thought it was ok.
> > > 
> > > /Anders
> > > 
> > > On Thu, Mar 23, 2006 at 06:54:35PM +0100, Nguyen Tien Dung wrote:
> > > > Dear all,
> > > > 
> > > > With gcc version 3.3.4, when I put the command: make demo from the
> > > top-level
> > > > directory of dolfin 0.6.0, I get the following errors:
> > > > 
> > > > 
> > > > main.cpp: In function `void solveConvectionDiffusion(dolfin::Mesh&,
> > > >    dolfin::Function&)':
> > > > main.cpp:22: error: parse error before `:' token
> > > > main.cpp: At global scope:
> > > > main.cpp:31: error: ISO C++ forbids declaration of `bc' with no type
> > > > main.cpp:34: error: parse error before `:' token
> > > > main.cpp:40: error: ISO C++ forbids declaration of `f' with no type
> > > > main.cpp:50: error: `mesh' was not declared in this scope
> > > > main.cpp:53: error: `velocity' was not declared in this scope
> > > > main.cpp:54: error: `velocity' was not declared in this scope
> > > > main.cpp:57: error: `mesh' was not declared in this scope
> > > > main.cpp:57: error: ISO C++ forbids declaration of `assemble' with no type
> > > > main.cpp:57: error: `int dolfin::FEM::assemble' is not a static member of
> > > `
> > > >    class dolfin::FEM'
> > > > main.cpp:57: error: initializer list being treated as compound expression
> > > > main.cpp:69: error: parse error before `while'
> > > > main.cpp:73: error: `mesh' was not declared in this scope
> > > > main.cpp:73: error: ISO C++ forbids declaration of `applyBC' with no type
> > > > main.cpp:73: error: `int dolfin::FEM::applyBC' is not a static member of
> > > `class
> > > >    dolfin::FEM'
> > > > main.cpp:73: error: initializer list being treated as compound expression
> > > > main.cpp:76: error: syntax error before `.' token
> > > > main.cpp:79: error: syntax error before `<<' token
> > > > main.cpp:82: error: ISO C++ forbids declaration of `p' with no type
> > > > main.cpp:82: error: conflicting types for `int p'
> > > > main.cpp:68: error: previous declaration as `dolfin::Progress p'
> > > > main.cpp:85: error: syntax error before `+=' token
> > > > main.cpp:86: error: ISO C++ forbids declaration of `U0' with no type
> > > > main.cpp:86: error: conflicting types for `int U0'
> > > > main.cpp:49: error: previous declaration as `dolfin::Function U0'
> > > > main.cpp:87: error: parse error before `}' token
> > > > main.cpp: In function `int main()':
> > > > main.cpp:93: error: parse error before `:' token
> > > > main.cpp:101: error: return-statement with no value, in function declared
> > > with
> > > >    a non-void return type
> > > > main.cpp: At global scope:
> > > > main.cpp:105: error: parse error before `if'
> > > > main.cpp:118: error: ISO C++ forbids declaration of `bc' with no type
> > > > main.cpp:118: error: redefinition of `int bc'
> > > > main.cpp:31: error: `int bc' previously declared here
> > > > main.cpp:122: error: conflicting types for `dolfin::Function f'
> > > > main.cpp:40: error: previous declaration as `int f'
> > > > main.cpp:123: error: conflicting types for `dolfin::Stokes::BilinearForm
> > > a'
> > > > main.cpp:53: error: previous declaration as `
> > > >    dolfin::ConvectionDiffusion::BilinearForm a'
> > > > main.cpp:124: error: conflicting types for `dolfin::Stokes::LinearForm L'
> > > > main.cpp:54: error: previous declaration as `
> > > >    dolfin::ConvectionDiffusion::LinearForm L'
> > > > main.cpp:125: error: invalid conversion from `int' to `dolfin::PDE::Type'
> > > > main.cpp:125: error:   initializing argument 4 of `
> > > >    dolfin::PDE::PDE(dolfin::BilinearForm&, dolfin::LinearForm&,
> > > dolfin::Mesh&,
> > > >    dolfin::PDE::Type)'
> > > > main.cpp:130: error: syntax error before `.' token
> > > > main.cpp:135: error: syntax error before `<<' token
> > > > main.cpp:136: error: syntax error before `<<' token
> > > > main.cpp:139: error: ISO C++ forbids declaration of
> > > `solveConvectionDiffusion'
> > > >    with no type
> > > > main.cpp:139: error: `int solveConvectionDiffusion' redeclared as
> > > different
> > > >    kind of symbol
> > > > main.cpp:20: error: previous declaration of `void
> > > >    solveConvectionDiffusion(dolfin::Mesh&, dolfin::Function&)'
> > > > main.cpp:139: error: initializer list being treated as compound expression
> > > > main.cpp:139: error: cannot convert `dolfin::Function' to `int' in
> > > >    initialization
> > > > main.cpp:140: error: parse error before `}' token
> > > > main.cpp:124: confused by earlier errors, bailing out
> > > > 
> > > > 
> > > > N.T.Dung
> > > > 
> > > 
> > 
> > 
> 
-- 
Dr. Garth N. Wells
Faculty of Civil Engineering and Geosciences
Delft University of Technology
Stevinweg 1
2628 CN Delft
The Netherlands

tel.     +31 15 278 7922
fax.     +31 15 278 6383
e-mail   g.n.wells@xxxxxxxxxx
url      http://www.mechanics.citg.tudelft.nl/~garth