scripted-diff: modernize outdated trait patterns - values

See https://en.cppreference.com/w/cpp/types/is_enum for more details.

-BEGIN VERIFY SCRIPT-
sed -i -E 's/(std::[a-z_]+)(<[^<>]+>)::value\b/\1_v\2/g' $(git grep -l '::value' ./src ':(exclude)src/bench/nanobench.h' ':(exclude)src/minisketch' ':(exclude)src/span.h')
-END VERIFY SCRIPT-

src/bench/prevector.cpp

@@ -16,11 +16,11 @@ struct nontrivial_t {
     nontrivial_t() = default;
     SERIALIZE_METHODS(nontrivial_t, obj) { READWRITE(obj.x); }
 };
-static_assert(!std::is_trivially_default_constructible<nontrivial_t>::value,
+static_assert(!std::is_trivially_default_constructible_v<nontrivial_t>,
               "expected nontrivial_t to not be trivially constructible");
 
 typedef unsigned char trivial_t;
-static_assert(std::is_trivially_default_constructible<trivial_t>::value,
+static_assert(std::is_trivially_default_constructible_v<trivial_t>,
               "expected trivial_t to be trivially constructible");
 
 template <typename T>

src/logging/timer.h

@@ -67,11 +67,11 @@ public:
         }
         const auto duration{end_time - *m_start_t};
 
-        if constexpr (std::is_same<TimeType, std::chrono::microseconds>::value) {
+        if constexpr (std::is_same_v<TimeType, std::chrono::microseconds>) {
             return strprintf("%s: %s (%iμs)", m_prefix, msg, Ticks<std::chrono::microseconds>(duration));
-        } else if constexpr (std::is_same<TimeType, std::chrono::milliseconds>::value) {
+        } else if constexpr (std::is_same_v<TimeType, std::chrono::milliseconds>) {
             return strprintf("%s: %s (%.2fms)", m_prefix, msg, Ticks<MillisecondsDouble>(duration));
-        } else if constexpr (std::is_same<TimeType, std::chrono::seconds>::value) {
+        } else if constexpr (std::is_same_v<TimeType, std::chrono::seconds>) {
             return strprintf("%s: %s (%.2fs)", m_prefix, msg, Ticks<SecondsDouble>(duration));
         } else {
             static_assert(ALWAYS_FALSE<TimeType>, "Error: unexpected time type");

src/serialize.h

@@ -220,13 +220,13 @@ const Out& AsBase(const In& x)
     template <typename Stream>                                                                      \
     void Serialize(Stream& s) const                                                                 \
     {                                                                                               \
-        static_assert(std::is_same<const cls&, decltype(*this)>::value, "Serialize type mismatch"); \
+        static_assert(std::is_same_v<const cls&, decltype(*this)>, "Serialize type mismatch"); \
         Ser(s, *this);                                                                              \
     }                                                                                               \
     template <typename Stream>                                                                      \
     void Unserialize(Stream& s)                                                                     \
     {                                                                                               \
-        static_assert(std::is_same<cls&, decltype(*this)>::value, "Unserialize type mismatch");     \
+        static_assert(std::is_same_v<cls&, decltype(*this)>, "Unserialize type mismatch");     \
         Unser(s, *this);                                                                            \
     }
 
@@ -408,8 +408,8 @@ template <VarIntMode Mode, typename I>
 struct CheckVarIntMode {
     constexpr CheckVarIntMode()
     {
-        static_assert(Mode != VarIntMode::DEFAULT || std::is_unsigned<I>::value, "Unsigned type required with mode DEFAULT.");
-        static_assert(Mode != VarIntMode::NONNEGATIVE_SIGNED || std::is_signed<I>::value, "Signed type required with mode NONNEGATIVE_SIGNED.");
+        static_assert(Mode != VarIntMode::DEFAULT || std::is_unsigned_v<I>, "Unsigned type required with mode DEFAULT.");
+        static_assert(Mode != VarIntMode::NONNEGATIVE_SIGNED || std::is_signed_v<I>, "Signed type required with mode NONNEGATIVE_SIGNED.");
     }
 };
 
@@ -474,7 +474,7 @@ I ReadVarInt(Stream& is)
 template<typename Formatter, typename T>
 class Wrapper
 {
-    static_assert(std::is_lvalue_reference<T>::value, "Wrapper needs an lvalue reference type T");
+    static_assert(std::is_lvalue_reference_v<T>, "Wrapper needs an lvalue reference type T");
 protected:
     T m_object;
 public:
@@ -545,7 +545,7 @@ struct CustomUintFormatter
 
     template <typename Stream, typename I> void Unser(Stream& s, I& v)
     {
-        using U = typename std::conditional<std::is_enum<I>::value, std::underlying_type<I>, std::common_type<I>>::type::type;
+        using U = typename std::conditional<std::is_enum_v<I>, std::underlying_type<I>, std::common_type<I>>::type::type;
         static_assert(std::numeric_limits<U>::max() >= MAX && std::numeric_limits<U>::min() <= 0, "Assigned type too small");
         uint64_t raw = 0;
         if (BigEndian) {
@@ -577,7 +577,7 @@ struct CompactSizeFormatter
     template<typename Stream, typename I>
     void Ser(Stream& s, I v)
     {
-        static_assert(std::is_unsigned<I>::value, "CompactSize only supported for unsigned integers");
+        static_assert(std::is_unsigned_v<I>, "CompactSize only supported for unsigned integers");
         static_assert(std::numeric_limits<I>::max() <= std::numeric_limits<uint64_t>::max(), "CompactSize only supports 64-bit integers and below");
 
         WriteCompactSize<Stream>(s, v);

src/sync.cpp

@@ -148,8 +148,8 @@ template <typename MutexType>
 static void push_lock(MutexType* c, const CLockLocation& locklocation)
 {
     constexpr bool is_recursive_mutex =
-        std::is_base_of<RecursiveMutex, MutexType>::value ||
-        std::is_base_of<std::recursive_mutex, MutexType>::value;
+        std::is_base_of_v<RecursiveMutex, MutexType> ||
+        std::is_base_of_v<std::recursive_mutex, MutexType>;
 
     LockData& lockdata = GetLockData();
     std::lock_guard<std::mutex> lock(lockdata.dd_mutex);

src/test/fuzz/FuzzedDataProvider.h

@@ -203,7 +203,7 @@ template <typename T> T FuzzedDataProvider::ConsumeIntegral() {
 // be less than or equal to |max|.
 template <typename T>
 T FuzzedDataProvider::ConsumeIntegralInRange(T min, T max) {
-  static_assert(std::is_integral<T>::value, "An integral type is required.");
+  static_assert(std::is_integral_v<T>, "An integral type is required.");
   static_assert(sizeof(T) <= sizeof(uint64_t), "Unsupported integral type.");
 
   if (min > max)
@@ -271,7 +271,7 @@ T FuzzedDataProvider::ConsumeFloatingPointInRange(T min, T max) {
 // Returns a floating point number in the range [0.0, 1.0]. If there's no
 // input data left, always returns 0.
 template <typename T> T FuzzedDataProvider::ConsumeProbability() {
-  static_assert(std::is_floating_point<T>::value,
+  static_assert(std::is_floating_point_v<T>,
                 "A floating point type is required.");
 
   // Use different integral types for different floating point types in order
@@ -294,7 +294,7 @@ inline bool FuzzedDataProvider::ConsumeBool() {
 // also contain |kMaxValue| aliased to its largest (inclusive) value. Such as:
 // enum class Foo { SomeValue, OtherValue, kMaxValue = OtherValue };
 template <typename T> T FuzzedDataProvider::ConsumeEnum() {
-  static_assert(std::is_enum<T>::value, "|T| must be an enum type.");
+  static_assert(std::is_enum_v<T>, "|T| must be an enum type.");
   return static_cast<T>(
       ConsumeIntegralInRange<uint32_t>(0, static_cast<uint32_t>(T::kMaxValue)));
 }

src/test/fuzz/integer.cpp

@@ -63,7 +63,7 @@ FUZZ_TARGET(integer, .init = initialize_integer)
     const int16_t i16 = fuzzed_data_provider.ConsumeIntegral<int16_t>();
     const uint8_t u8 = fuzzed_data_provider.ConsumeIntegral<uint8_t>();
     const int8_t i8 = fuzzed_data_provider.ConsumeIntegral<int8_t>();
-    // We cannot assume a specific value of std::is_signed<char>::value:
+    // We cannot assume a specific value of std::is_signed_v<char>:
     // ConsumeIntegral<char>() instead of casting from {u,}int8_t.
     const char ch = fuzzed_data_provider.ConsumeIntegral<char>();
     const bool b = fuzzed_data_provider.ConsumeBool();

src/test/fuzz/util.h

@@ -207,7 +207,7 @@ template <typename WeakEnumType, size_t size>
 template <typename T>
 [[nodiscard]] bool MultiplicationOverflow(const T i, const T j) noexcept
 {
-    static_assert(std::is_integral<T>::value, "Integral required.");
+    static_assert(std::is_integral_v<T>, "Integral required.");
     if (std::numeric_limits<T>::is_signed) {
         if (i > 0) {
             if (j > 0) {

src/univalue/include/univalue.h

@@ -137,7 +137,7 @@ void UniValue::push_backV(It first, It last)
 template <typename Int>
 Int UniValue::getInt() const
 {
-    static_assert(std::is_integral<Int>::value);
+    static_assert(std::is_integral_v<Int>);
     checkType(VNUM);
     Int result;
     const auto [first_nonmatching, error_condition] = std::from_chars(val.data(), val.data() + val.size(), result);

src/util/fs.h

@@ -163,7 +163,7 @@ static inline std::string PathToString(const path& path)
 #ifdef WIN32
     return path.utf8string();
 #else
-    static_assert(std::is_same<path::string_type, std::string>::value, "PathToString not implemented on this platform");
+    static_assert(std::is_same_v<path::string_type, std::string>, "PathToString not implemented on this platform");
     return path.std::filesystem::path::string();
 #endif
 }

src/util/overflow.h

@@ -14,7 +14,7 @@
 template <class T>
 [[nodiscard]] bool AdditionOverflow(const T i, const T j) noexcept
 {
-    static_assert(std::is_integral<T>::value, "Integral required.");
+    static_assert(std::is_integral_v<T>, "Integral required.");
     if constexpr (std::numeric_limits<T>::is_signed) {
         return (i > 0 && j > std::numeric_limits<T>::max() - i) ||
                (i < 0 && j < std::numeric_limits<T>::min() - i);

src/util/strencodings.cpp

@@ -204,7 +204,7 @@ namespace {
 template <typename T>
 bool ParseIntegral(std::string_view str, T* out)
 {
-    static_assert(std::is_integral<T>::value);
+    static_assert(std::is_integral_v<T>);
     // Replicate the exact behavior of strtol/strtoll/strtoul/strtoull when
     // handling leading +/- for backwards compatibility.
     if (str.length() >= 2 && str[0] == '+' && str[1] == '-') {

src/util/strencodings.h

@@ -117,7 +117,7 @@ bool SplitHostPort(std::string_view in, uint16_t& portOut, std::string& hostOut)
 template <typename T>
 T LocaleIndependentAtoi(std::string_view str)
 {
-    static_assert(std::is_integral<T>::value);
+    static_assert(std::is_integral_v<T>);
     T result;
     // Emulate atoi(...) handling of white space and leading +/-.
     std::string_view s = util::TrimStringView(str);
@@ -178,7 +178,7 @@ constexpr inline bool IsSpace(char c) noexcept {
 template <typename T>
 std::optional<T> ToIntegral(std::string_view str)
 {
-    static_assert(std::is_integral<T>::value);
+    static_assert(std::is_integral_v<T>);
     T result;
     const auto [first_nonmatching, error_condition] = std::from_chars(str.data(), str.data() + str.size(), result);
     if (first_nonmatching != str.data() + str.size() || error_condition != std::errc{}) {