It is possible and it works :-)
But with operator overloading it is so much more readable, than without it.
Creating queries at runtime is quite common:
age = 20;
string query = "Select name, surname FROM persons WHERE age = " +
to!(string)(age);
that is not object + operator based - your flexibilty here comes from
your string and the "runtime" interpretation of the sql semantic in your
database ...
if you need an additional "LIKE" based on an codition you need to
rebuild your object/operator concatination in complete:
if( gui.checkbox == true )
{
SELECT a from b
}
else
{
SELECT a from b WHERE c LIKE '% ~ C ~ %'
}
Compile time checking of SQLs will not be enough for any bigger program.
How would you insert your data into database? INSERT needs values which
are taken e.g. from GUI and completely unknown at compile-time.
why is a value that comes from an gui not compile-time?
not the value is what you need - its the type (when we talk about type
safetyness)
how does vector-array get into Don's Blade strings? and why do i get
compile-time errors when using the wrong type inside of the string?
and you can't even speak of type-safetyness when using only strings in
your database communication - how can be your results typesafe
(i don't like string[string] results-set) because the safetiness is
programatical
BTW. In recent release Boost team added a whole brand new library for
domain specific languages embedded languages called Proto. I think that
it means that there is quite a big need for such features. E.g. for
mocking frameworks which will also profit from extended DSL sublanguages
support in programming languages.
you should read into the details of using mixins - they are much much
more flexible than you think (not just boring strings) - and with the
base feature-set of D something like mock wouldn't even exist
and what the boost guys to is to get around c++ base feature-set to
express new thing with c++
@Ary does syntax coloring and smart auto-completen help while writing
spirit based parsers? the complete meaning of ( * - \ ... is different
to "normal" code
btw: don syntaxtree is also an great example of using mixins
http://www.dsource.org/projects/mathextra/browser/trunk/blade/SyntaxTree.d
