The D Programming Language's Unofficial Docs
beta
The D Programming Language's Unofficial Docs
beta
Convert wrapped value to a human readable string
alias MyInt = Typedef!int; MyInt foo = 10; foo++; assert(foo == 11);
custom initialization values
alias MyIntInit = Typedef!(int, 42); static assert(is(TypedefType!MyIntInit == int)); static assert(MyIntInit() == 42);
Typedef creates a new type
alias MyInt = Typedef!int; static void takeInt(int) {} static void takeMyInt(MyInt) {} int i; takeInt(i); // ok static assert(!__traits(compiles, takeMyInt(i))); MyInt myInt; static assert(!__traits(compiles, takeInt(myInt))); takeMyInt(myInt); // ok
Use the optional cookie argument to create different types of the same base type
alias TypeInt1 = Typedef!int; alias TypeInt2 = Typedef!int; // The two Typedefs are the same type. static assert(is(TypeInt1 == TypeInt2)); alias MoneyEuros = Typedef!(float, float.init, "euros"); alias MoneyDollars = Typedef!(float, float.init, "dollars"); // The two Typedefs are _not_ the same type. static assert(!is(MoneyEuros == MoneyDollars));
Typedef allows the creation of a unique type which is based on an existing type. Unlike the alias feature, Typedef ensures the two types are not considered as equals.