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common: Make use of [[nodiscard]] where applicable

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Now that clang-format makes [[nodiscard]] attributes format sensibly, we
can apply them to several functions within the common library to allow
the compiler to complain about any misuses of the functions.
This commit is contained in:
Lioncash 2020-08-14 09:38:45 -04:00
parent 2b601e8636
commit df72480395
34 changed files with 343 additions and 358 deletions
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23
src/common/cityhash.h
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@ -61,42 +61,43 @@
#pragma once
#include <cstddef>
#include <cstdint>
#include <utility>
#include <stdint.h>
#include <stdlib.h> // for std::size_t.
namespace Common {
typedef std::pair<uint64_t, uint64_t> uint128;
using uint128 = std::pair<uint64_t, uint64_t>;
inline uint64_t Uint128Low64(const uint128& x) {
[[nodiscard]] inline uint64_t Uint128Low64(const uint128& x) {
return x.first;
}
inline uint64_t Uint128High64(const uint128& x) {
[[nodiscard]] inline uint64_t Uint128High64(const uint128& x) {
return x.second;
}
// Hash function for a byte array.
uint64_t CityHash64(const char* buf, std::size_t len);
[[nodiscard]] uint64_t CityHash64(const char* buf, std::size_t len);
// Hash function for a byte array. For convenience, a 64-bit seed is also
// hashed into the result.
uint64_t CityHash64WithSeed(const char* buf, std::size_t len, uint64_t seed);
[[nodiscard]] uint64_t CityHash64WithSeed(const char* buf, std::size_t len, uint64_t seed);
// Hash function for a byte array. For convenience, two seeds are also
// hashed into the result.
uint64_t CityHash64WithSeeds(const char* buf, std::size_t len, uint64_t seed0, uint64_t seed1);
[[nodiscard]] uint64_t CityHash64WithSeeds(const char* buf, std::size_t len, uint64_t seed0,
uint64_t seed1);
// Hash function for a byte array.
uint128 CityHash128(const char* s, std::size_t len);
[[nodiscard]] uint128 CityHash128(const char* s, std::size_t len);
// Hash function for a byte array. For convenience, a 128-bit seed is also
// hashed into the result.
uint128 CityHash128WithSeed(const char* s, std::size_t len, uint128 seed);
[[nodiscard]] uint128 CityHash128WithSeed(const char* s, std::size_t len, uint128 seed);
// Hash 128 input bits down to 64 bits of output.
// This is intended to be a reasonably good hash function.
inline uint64_t Hash128to64(const uint128& x) {
[[nodiscard]] inline uint64_t Hash128to64(const uint128& x) {
// Murmur-inspired hashing.
const uint64_t kMul = 0x9ddfea08eb382d69ULL;
uint64_t a = (Uint128Low64(x) ^ Uint128High64(x)) * kMul;