Added cppbitmask with tests, added travis CI build

src/cppbitmask.h

@@ -0,0 +1,49 @@
+#pragma once
+
+// system includes
+#include <cstdint>
+#include <stdexcept>
+
+namespace cpputils {
+template<typename T>
+class basic_bit_pattern
+{
+    T expected{};
+    T mask{};
+
+public:
+    template<std::size_t Size>
+    explicit constexpr basic_bit_pattern(const char (&input)[Size])
+    {
+        T cur_bit = (1 << (Size - 2));
+        for (const char val : input)
+        {
+            switch (val)
+            {
+            case 0:
+                return;
+            case '1':
+                expected |= cur_bit;
+            [[fallthrough]];
+            case '0':
+                mask |= cur_bit;
+                break;
+            case 'x':
+            case 'X':
+                break;
+            default:
+                throw std::logic_error{"Unknown characters in bit pattern input"};
+            }
+
+            cur_bit >>= 1;
+        }
+    }
+
+    constexpr friend bool operator==(const T value, const basic_bit_pattern &pattern)
+    {
+        return (value & pattern.mask) == pattern.expected;
+    }
+};
+
+using bit_pattern = basic_bit_pattern<std::uint32_t>;
+} // namespace cpputils