'float' is invalid template constant parameter error.

Jenkins, Bart (NE) Bart.Jenkins@gd-ais.com
Tue May 31 20:14:00 GMT 2005

  Here is a bit of code, boiled down to it's essence, that works fine in both Visual C++ 6.0 sp 6 and Intel for Windows 8.1 but fails in GCC 3.2.3 and 3.4:


template <typename T, T delta_val>
class AdaNumeric_T
  T t;

typedef AdaNumeric_T<int,1> AdaIntType;
typedef AdaNumeric_T<float,1.0> AdaFloatType;

int main(int argc, char* argv[])
  return 0;

(Please ignore the fact that I don't do anything with 'delta_val' and nothing is getting assigned to 'T t')


The typedef 'typedef AdaNumeric_T<int,1> AdaIntType;' works fine but the version right beneath it with the float type does not.  I get a:

"'float' is not a valid type for a template constant parameter"

Which seems strange.

Is the Intel compiler more ANSI compliant than GCC or is this a bug in GCC?  Does this work in GCC 4.0?


Bart Jenkins
ph: (703) 263-2883
General Dynamics
Advanced Information Systems
12450 Fair Lakes Circle
Fairfax, VA 22033

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