Add Int#bits_set? method (#5619)

RX14 · web-flow · commit e5da7d3ec20b · 2018-01-21T16:12:47.000Z
diff --git a/src/colorize.cr b/src/colorize.cr
@@ -318,7 +318,7 @@ struct Colorize::Object(T)
       unless mode_is_default
         # Can't reuse MODES constant because it has bold/bright duplicated
         {% for name in %w(bold dim underline blink reverse hidden) %}
-          if (@mode & MODE_{{name.upcase.id}}_FLAG) != 0
+          if @mode.bits_set? MODE_{{name.upcase.id}}_FLAG
             io << ";" if printed
             io << MODE_{{name.upcase.id}}
             printed = true
diff --git a/src/crystal/system/unix/file_descriptor.cr b/src/crystal/system/unix/file_descriptor.cr
@@ -27,7 +27,8 @@ module Crystal::System::FileDescriptor
   end
 
   private def system_blocking?
-    fcntl(LibC::F_GETFL) & LibC::O_NONBLOCK == 0
+    flags = fcntl(LibC::F_GETFL)
+    !flags.bits_set? LibC::O_NONBLOCK
   end
 
   private def system_blocking=(value)
@@ -43,7 +44,7 @@ module Crystal::System::FileDescriptor
 
   private def system_close_on_exec?
     flags = fcntl(LibC::F_GETFD)
-    (flags & LibC::FD_CLOEXEC) == LibC::FD_CLOEXEC
+    flags.bits_set? LibC::FD_CLOEXEC
   end
 
   private def system_close_on_exec=(arg : Bool)
diff --git a/src/debug/mach_o.cr b/src/debug/mach_o.cr
@@ -117,7 +117,7 @@ module Debug
     end
 
     def abi64?
-      cputype.value & ABI64 == ABI64
+      cputype.value.bits_set? ABI64
     end
 
     def endianness
@@ -292,11 +292,11 @@ module Debug
         end
 
         def pext?
-          (value & PEXT) == PEXT
+          value.bits_set? PEXT
         end
 
         def ext?
-          (value & EXT) == EXT
+          value.bits_set? EXT
         end
 
         {% for flag in %w(UNDF ABS SECT PBUD INDR) %}
diff --git a/src/enum.cr b/src/enum.cr
@@ -100,7 +100,7 @@ struct Enum
         found = false
         {% for member in @type.constants %}
           {% if member.stringify != "All" %}
-            if {{@type}}::{{member}}.value != 0 && (value & {{@type}}::{{member}}.value) == {{@type}}::{{member}}.value
+            if {{@type}}::{{member}}.value != 0 && value.bits_set? {{@type}}::{{member}}.value
               io << " | " if found
               io << {{member.stringify}}
               found = true
diff --git a/src/int.cr b/src/int.cr
@@ -296,6 +296,17 @@ struct Int
     self >> bit & 1
   end
 
+  # Returns `true` if all bits in *mask* are set on `self`.
+  #
+  # ```
+  # 0b0110.bits_set?(0b0110) # => true
+  # 0b1101.bits_set?(0b0111) # => false
+  # 0b1101.bits_set?(0b1100) # => true
+  # ```
+  def bits_set?(mask)
+    (self & mask) == mask
+  end
+
   def gcd(other : Int)
     self == 0 ? other.abs : (other % self).gcd(self)
   end
