flagEnum

Creates a set of flags.

@safe pure nothrow @nogc

mixin template flagEnum (

string name

Args...

)

Bugs

As it is implemented as a struct, Enum.init behaves like lvalue (except it can't be assigned to), see $(DBUGZILLA 8915). I.e. (ref Enum e){ } (Enum.init) compiles.

As it is a struct, op assignment operators are allowed for rvalues, see $(DBUGZILLA 8916). I.e. things like Enum.init |= Enum.a and Enum.a |= Enum.a compiles.

Examples

mixin flagEnum!("Access", byte, "read = 2", "write", "execute"); // write == 4, execute == 8

assert(cast(uint) Access.init == 0);
assert(cast(uint) Access.write == 4);
assert(cast(uint) Access.execute == 8);

auto folderAccess = Access.read | Access.execute;
auto fileAccess   = Access.read | Access.write | Access.execute;

fileAccess &= folderAccess;
assert(fileAccess == (Access.read | Access.execute));

if(fileAccess)
{
	// have some access
}
else
	assert(0);


import std.stdio: writeln;

writeln(fileAccess & Access.read);   // Writes "Access.read"
writeln(fileAccess);                 // Writes "Access.{read|execute}"
writeln(fileAccess & Access.write);  // Writes "Access.{}"

flagEnum

Bugs

Examples

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