file rawRead and rawWrite in chunks example

[Ali Çehreli via Digitalmars-d-learn]

On 08/08/2015 07:07 PM, Jay Norwood wrote:

 > On Sunday, 9 August 2015 at 00:50:16 UTC, Ali Çehreli wrote:
 >>         // NOTE: No need to tell rawRead the type as double
 >>         iota(10, 20_000_000 + 10, n)
 >>             .each!(a => f.rawRead(dbv));
 >>     }
 >>
 >> Ali
 >
 > Your f.rawRead(dbv) form compiles, but f.rawRead!(dbv) results in an
 > error msg in  compiler error in 2.067.1. The f.rawRead!(double)(dbv)
 > form works.

rawRead is a member function template with one template parameter and 
one function parameter:

     T[] rawRead(T)(T[] buffer);

The single template parameter T is the element type of its function 
parameter, which is a dynamic array.

In this case, function template type deduction works and the template 
parameter need not be provided because dbv is of type double[] and it is 
obvious that T is double:

     f.rawRead(dbv)    // <- compiles

It is the same thing as proving T explicitly as double:

     f.rawRead!(double)(dbv)    // <- compiles

The code that does not compile has an error because it provides dbv as a 
template argument (because it is in the parameter list that comes right 
after !):

     f.rawRead!(dbv)    // oops, dbv should be the function argument not 
the template argument

Ali