C++ for Scientists - Technische Universität Dresden

186 CHAPTER 5. META-PROGRAMMING
template
scalar times vector expressions operator∗( Scalar const& s, Vector const& v ) {
return scalar times vector expressions( s, v ) ;
}
Put all classes and functions in the namespace athens. You can also make an expression template
for the addition of two vectors.
Write a small program, e.g.
int main() {
athens::my vector v( 5 ) ;
... Fill in some values of v ...
athens::my vector w( 5 ) ;
w = 5.0 ∗ v ;
w = 5.0 ∗ (7.0 ∗ v ) ;
w = v + 7.0∗v ; // (If you have added the operator+)
}
Use the debugger to see what happens.