const and call by value parameters

I have a function

void myobject::g (double d)
{
dval = d;
}

Now function g() doesn't modify it's local copy of d in any way, therefore
it should be declared as

void myobject::g (const double d) {}

The thing is, I find that the vast majority of my call by value parameters
aren't reused within their functions, therefore I find that I have an awful
lot of function parameters using the const modifier.

When I look at other code, in books or in libraries, you don't tend to see
const littered throughout the code, even in functions that don't modify
their value parameters.

Am I missing something here?

--
Best regards
Mark


.

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