Increases const correctness, marks some additional constructors as constexpr, switches std::atomic construction style.

Numeric/CRC.hpp

@@ -21,7 +21,7 @@ template <typename IntType, IntType reset_value, IntType output_xor, bool reflec
 			Instantiates a CRC16 that will compute the CRC16 specified by the supplied
 			@c polynomial and @c reset_value.
 		*/
-		Generator(IntType polynomial): value_(reset_value) {
+		constexpr Generator(IntType polynomial) noexcept: value_(reset_value) {
 			const IntType top_bit = IntType(~(IntType(~0) >> 1));
 			for(int c = 0; c < 256; c++) {
 				IntType shift_value = IntType(c << multibyte_shift);

Numeric/LFSR.hpp

@@ -43,7 +43,7 @@ template <typename IntType = uint64_t, IntType polynomial = LSFRPolynomial<IntTy
 		/*!
 			Constructs an LFSR with a random initial value.
 		*/
-		LFSR() {
+		constexpr LFSR() noexcept {
 			// Randomise the value, ensuring it doesn't end up being 0;
 			// don't set any top bits, in case this is a signed type.
 			while(!value_) {