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Type-safe and human-readable sets of bool flags.
Start by declaring some types
class eats_meat; class eats_grass; class has_tail;
Then bind these types to flag identifiers
typedef typed_flags<eats_meat, eats_grass, has_tail> animal;Create flags from scratch
animal wolf; wolf.set<eats_grass>(false); wolf.set<eats_meat, has_tail>(); wolf.set(flag<has_tail>{1}, flag<eats_meat>{1});
Create flags with a flexible human-readable constructor
wolf = animal{flag<has_tail>{1}, flag<eats_meat>{1}, flag<eats_grass>{0}};Test each flag separately
assert( (wolf.test<eats_meat>() && wolf.test<has_tail>()) );Test a group of flags in one call
assert( (wolf.all<eats_meat, has_tail>()) ); assert( (wolf.any<eats_meat, has_tail, eats_grass>()) ); assert( (wolf.none<eats_grass>()) );
Extract flag values
flag<eats_meat> f1;
flag<has_tail> f2;
wolf.get(f1, f2);
assert( f1 && f2 );Create flags from integers or strings and convert back and forth - like std::bitset
auto a1 = animal{3}; auto a2 = animal{"101"}; assert( a1.to_integral<int>() == 3 ); assert( a2.to_string() == "101" );
You can find more detailed info here.
To build tests and examples you need
- cmake
- compiler supporting fold-expressions from C++17 (GCC 6, Clang 3.8+)