Remove backports of std (#9246)

esphome/core/datatypes.h

@@ -11,7 +11,7 @@ namespace internal {
 /// Wrapper class for memory using big endian data layout, transparently converting it to native order.
 template<typename T> class BigEndianLayout {
  public:
-  constexpr14 operator T() { return convert_big_endian(val_); }
+  constexpr operator T() { return convert_big_endian(val_); }
 
  private:
   T val_;
@@ -20,7 +20,7 @@ template<typename T> class BigEndianLayout {
 /// Wrapper class for memory using big endian data layout, transparently converting it to native order.
 template<typename T> class LittleEndianLayout {
  public:
-  constexpr14 operator T() { return convert_little_endian(val_); }
+  constexpr operator T() { return convert_little_endian(val_); }
 
  private:
   T val_;

esphome/core/helpers.cpp

@@ -76,23 +76,8 @@ static const uint16_t CRC16_1021_BE_LUT_H[] = {0x0000, 0x1231, 0x2462, 0x3653, 0
                                                0x9188, 0x83b9, 0xb5ea, 0xa7db, 0xd94c, 0xcb7d, 0xfd2e, 0xef1f};
 #endif
 
-// STL backports
-
-#if _GLIBCXX_RELEASE < 8
-std::string to_string(int value) { return str_snprintf("%d", 32, value); }                   // NOLINT
-std::string to_string(long value) { return str_snprintf("%ld", 32, value); }                 // NOLINT
-std::string to_string(long long value) { return str_snprintf("%lld", 32, value); }           // NOLINT
-std::string to_string(unsigned value) { return str_snprintf("%u", 32, value); }              // NOLINT
-std::string to_string(unsigned long value) { return str_snprintf("%lu", 32, value); }        // NOLINT
-std::string to_string(unsigned long long value) { return str_snprintf("%llu", 32, value); }  // NOLINT
-std::string to_string(float value) { return str_snprintf("%f", 32, value); }
-std::string to_string(double value) { return str_snprintf("%f", 32, value); }
-std::string to_string(long double value) { return str_snprintf("%Lf", 32, value); }
-#endif
-
 // Mathematics
 
-float lerp(float completion, float start, float end) { return start + (end - start) * completion; }
 uint8_t crc8(const uint8_t *data, uint8_t len) {
   uint8_t crc = 0;
 

esphome/core/helpers.h

@@ -37,89 +37,18 @@
 #define ESPHOME_ALWAYS_INLINE __attribute__((always_inline))
 #define PACKED __attribute__((packed))
 
-// Various functions can be constexpr in C++14, but not in C++11 (because their body isn't just a return statement).
-// Define a substitute constexpr keyword for those functions, until we can drop C++11 support.
-#if __cplusplus >= 201402L
-#define constexpr14 constexpr
-#else
-#define constexpr14 inline  // constexpr implies inline
-#endif
-
 namespace esphome {
 
 /// @name STL backports
 ///@{
 
-// Backports for various STL features we like to use. Pull in the STL implementation wherever available, to avoid
+// Keep "using" even after the removal of our backports, to avoid breaking existing code.
-// ambiguity and to provide a uniform API.
-
-// std::to_string() from C++11, available from libstdc++/g++ 8
-// See https://github.com/espressif/esp-idf/issues/1445
-#if _GLIBCXX_RELEASE >= 8
 using std::to_string;
-#else
-std::string to_string(int value);                 // NOLINT
-std::string to_string(long value);                // NOLINT
-std::string to_string(long long value);           // NOLINT
-std::string to_string(unsigned value);            // NOLINT
-std::string to_string(unsigned long value);       // NOLINT
-std::string to_string(unsigned long long value);  // NOLINT
-std::string to_string(float value);
-std::string to_string(double value);
-std::string to_string(long double value);
-#endif
-
-// std::is_trivially_copyable from C++11, implemented in libstdc++/g++ 5.1 (but minor releases can't be detected)
-#if _GLIBCXX_RELEASE >= 6
 using std::is_trivially_copyable;
-#else
-// Implementing this is impossible without compiler intrinsics, so don't bother. Invalid usage will be detected on
-// other variants that use a newer compiler anyway.
-// NOLINTNEXTLINE(readability-identifier-naming)
-template<typename T> struct is_trivially_copyable : public std::integral_constant<bool, true> {};
-#endif
-
-// std::make_unique() from C++14
-#if __cpp_lib_make_unique >= 201304
 using std::make_unique;
-#else
-template<typename T, typename... Args> std::unique_ptr<T> make_unique(Args &&...args) {
-  return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
-}
-#endif
-
-// std::enable_if_t from C++14
-#if __cplusplus >= 201402L
 using std::enable_if_t;
-#else
-template<bool B, class T = void> using enable_if_t = typename std::enable_if<B, T>::type;
-#endif
-
-// std::clamp from C++17
-#if __cpp_lib_clamp >= 201603
 using std::clamp;
-#else
-template<typename T, typename Compare> constexpr const T &clamp(const T &v, const T &lo, const T &hi, Compare comp) {
-  return comp(v, lo) ? lo : comp(hi, v) ? hi : v;
-}
-template<typename T> constexpr const T &clamp(const T &v, const T &lo, const T &hi) {
-  return clamp(v, lo, hi, std::less<T>{});
-}
-#endif
-
-// std::is_invocable from C++17
-#if __cpp_lib_is_invocable >= 201703
 using std::is_invocable;
-#else
-// https://stackoverflow.com/a/37161919/8924614
-template<class T, class... Args> struct is_invocable {  // NOLINT(readability-identifier-naming)
-  template<class U> static auto test(U *p) -> decltype((*p)(std::declval<Args>()...), void(), std::true_type());
-  template<class U> static auto test(...) -> decltype(std::false_type());
-  static constexpr auto value = decltype(test<T>(nullptr))::value;  // NOLINT
-};
-#endif
-
-// std::bit_cast from C++20
 #if __cpp_lib_bit_cast >= 201806
 using std::bit_cast;
 #else
@@ -134,31 +63,29 @@ To bit_cast(const From &src) {
   return dst;
 }
 #endif
+using std::lerp;
 
 // std::byteswap from C++23
-template<typename T> constexpr14 T byteswap(T n) {
+template<typename T> constexpr T byteswap(T n) {
   T m;
   for (size_t i = 0; i < sizeof(T); i++)
     reinterpret_cast<uint8_t *>(&m)[i] = reinterpret_cast<uint8_t *>(&n)[sizeof(T) - 1 - i];
   return m;
 }
-template<> constexpr14 uint8_t byteswap(uint8_t n) { return n; }
+template<> constexpr uint8_t byteswap(uint8_t n) { return n; }
-template<> constexpr14 uint16_t byteswap(uint16_t n) { return __builtin_bswap16(n); }
+template<> constexpr uint16_t byteswap(uint16_t n) { return __builtin_bswap16(n); }
-template<> constexpr14 uint32_t byteswap(uint32_t n) { return __builtin_bswap32(n); }
+template<> constexpr uint32_t byteswap(uint32_t n) { return __builtin_bswap32(n); }
-template<> constexpr14 uint64_t byteswap(uint64_t n) { return __builtin_bswap64(n); }
+template<> constexpr uint64_t byteswap(uint64_t n) { return __builtin_bswap64(n); }
-template<> constexpr14 int8_t byteswap(int8_t n) { return n; }
+template<> constexpr int8_t byteswap(int8_t n) { return n; }
-template<> constexpr14 int16_t byteswap(int16_t n) { return __builtin_bswap16(n); }
+template<> constexpr int16_t byteswap(int16_t n) { return __builtin_bswap16(n); }
-template<> constexpr14 int32_t byteswap(int32_t n) { return __builtin_bswap32(n); }
+template<> constexpr int32_t byteswap(int32_t n) { return __builtin_bswap32(n); }
-template<> constexpr14 int64_t byteswap(int64_t n) { return __builtin_bswap64(n); }
+template<> constexpr int64_t byteswap(int64_t n) { return __builtin_bswap64(n); }
 
 ///@}
 
 /// @name Mathematics
 ///@{
 
-/// Linearly interpolate between \p start and \p end by \p completion (between 0 and 1).
-float lerp(float completion, float start, float end);
-
 /// Remap \p value from the range (\p min, \p max) to (\p min_out, \p max_out).
 template<typename T, typename U> T remap(U value, U min, U max, T min_out, T max_out) {
   return (value - min) * (max_out - min_out) / (max - min) + min_out;
@@ -203,8 +130,7 @@ constexpr uint32_t encode_uint32(uint8_t byte1, uint8_t byte2, uint8_t byte3, ui
 }
 
 /// Encode a value from its constituent bytes (from most to least significant) in an array with length sizeof(T).
-template<typename T, enable_if_t<std::is_unsigned<T>::value, int> = 0>
+template<typename T, enable_if_t<std::is_unsigned<T>::value, int> = 0> constexpr T encode_value(const uint8_t *bytes) {
-constexpr14 T encode_value(const uint8_t *bytes) {
   T val = 0;
   for (size_t i = 0; i < sizeof(T); i++) {
     val <<= 8;
@@ -214,12 +140,12 @@ constexpr14 T encode_value(const uint8_t *bytes) {
 }
 /// Encode a value from its constituent bytes (from most to least significant) in an std::array with length sizeof(T).
 template<typename T, enable_if_t<std::is_unsigned<T>::value, int> = 0>
-constexpr14 T encode_value(const std::array<uint8_t, sizeof(T)> bytes) {
+constexpr T encode_value(const std::array<uint8_t, sizeof(T)> bytes) {
   return encode_value<T>(bytes.data());
 }
 /// Decode a value into its constituent bytes (from most to least significant).
 template<typename T, enable_if_t<std::is_unsigned<T>::value, int> = 0>
-constexpr14 std::array<uint8_t, sizeof(T)> decode_value(T val) {
+constexpr std::array<uint8_t, sizeof(T)> decode_value(T val) {
   std::array<uint8_t, sizeof(T)> ret{};
   for (size_t i = sizeof(T); i > 0; i--) {
     ret[i - 1] = val & 0xFF;
@@ -246,7 +172,7 @@ inline uint32_t reverse_bits(uint32_t x) {
 }
 
 /// Convert a value between host byte order and big endian (most significant byte first) order.
-template<typename T> constexpr14 T convert_big_endian(T val) {
+template<typename T> constexpr T convert_big_endian(T val) {
 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
   return byteswap(val);
 #else
@@ -255,7 +181,7 @@ template<typename T> constexpr14 T convert_big_endian(T val) {
 }
 
 /// Convert a value between host byte order and little endian (least significant byte first) order.
-template<typename T> constexpr14 T convert_little_endian(T val) {
+template<typename T> constexpr T convert_little_endian(T val) {
 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
   return val;
 #else
@@ -276,9 +202,6 @@ bool str_startswith(const std::string &str, const std::string &start);
 /// Check whether a string ends with a value.
 bool str_endswith(const std::string &str, const std::string &end);
 
-/// Convert the value to a string (added as extra overload so that to_string() can be used on all stringifiable types).
-inline std::string to_string(const std::string &val) { return val; }
-
 /// Truncate a string to a specific length.
 std::string str_truncate(const std::string &str, size_t length);