harmonize files to use "east const"

manually checked modified files for errors, but not committing .clang-format due to the following warning:
>>> Setting `QualifierAlignment` to something other than `Leave`, COULD lead to incorrect code formatting due to incorrect decisions made due to clang-formats lack of complete semantic information. As such extra care should be taken to review code changes made by the use of this option.

README.md

@@ -16,22 +16,22 @@ floating-point numbers with a C++17-like syntax (the library itself only
 requires C++11):
 
 ```C++
-from_chars_result from_chars(const char* first, const char* last, float& value, ...);
-from_chars_result from_chars(const char* first, const char* last, double& value, ...);
+from_chars_result from_chars(char const *first, char const *last, float &value, ...);
+from_chars_result from_chars(char const *first, char const *last, double &value, ...);
 ```
 
 You can also parse integer types:
 
 ```C++
-from_chars_result from_chars(const char* first, const char* last, int& value, ...);
-from_chars_result from_chars(const char* first, const char* last, unsigned& value, ...);
+from_chars_result from_chars(char const *first, char const *last, int &value, ...);
+from_chars_result from_chars(char const *first, char const *last, unsigned &value, ...);
 ```
 
 The return type (`from_chars_result`) is defined as the struct:
 
 ```C++
 struct from_chars_result {
-  const char* ptr;
+  char const *ptr;
   std::errc ec;
 };
 ```
@@ -60,7 +60,7 @@ Example:
 #include <iostream>
 
 int main() {
-  const std::string input = "3.1416 xyz ";
+  std::string input = "3.1416 xyz ";
   double result;
   auto answer = fast_float::from_chars(input.data(), input.data() + input.size(), result);
   if (answer.ec != std::errc()) { std::cerr << "parsing failure\n"; return EXIT_FAILURE; }
@@ -72,7 +72,7 @@ int main() {
 You can parse delimited numbers:
 
 ```C++
-  const std::string input = "234532.3426362,7869234.9823,324562.645";
+  std::string input = "234532.3426362,7869234.9823,324562.645";
   double result;
   auto answer = fast_float::from_chars(input.data(), input.data() + input.size(), result);
   if (answer.ec != std::errc()) {
@@ -143,26 +143,26 @@ following code will print the number 22250738585072012 three times:
 
 int main() {
   uint64_t i;
-  const char str[] = "22250738585072012";
-  auto answer = fast_float::from_chars(str, str + strlen(str), i);
+  std::string str = "22250738585072012";
+  auto answer = fast_float::from_chars(str.data(), str.data() + str.size(), i);
   if (answer.ec != std::errc()) {
     std::cerr << "parsing failure\n";
     return EXIT_FAILURE;
   }
   std::cout << "parsed the number "<< i << std::endl;
 
-  const char binstr[] = "1001111000011001110110111001001010110100111000110001100";
+  std::string binstr = "1001111000011001110110111001001010110100111000110001100";
 
-  answer = fast_float::from_chars(binstr, binstr + strlen(binstr), i, 2);
+  answer = fast_float::from_chars(binstr.data(), binstr.data() + binstr.size(), i, 2);
   if (answer.ec != std::errc()) {
     std::cerr << "parsing failure\n";
     return EXIT_FAILURE;
   }
   std::cout << "parsed the number "<< i << std::endl;
 
-  const char hexstr[] = "4f0cedc95a718c";
+  std::string hexstr = "4f0cedc95a718c";
 
-  answer = fast_float::from_chars(hexstr, hexstr + strlen(hexstr), i, 16);
+  answer = fast_float::from_chars(hexstr.data(), hexstr.data() + hexstr.size(), i, 16);
   if (answer.ec != std::errc()) {
     std::cerr << "parsing failure\n";
     return EXIT_FAILURE;
@@ -259,7 +259,7 @@ following example:
 #include <iostream>
 
 int main() {
-  const std::u16string input = u"3.1416 xyz ";
+  std::u16string input = u"3.1416 xyz ";
   double result;
   auto answer = fast_float::from_chars(input.data(), input.data() + input.size(), result);
   if (answer.ec != std::errc()) { std::cerr << "parsing failure\n"; return EXIT_FAILURE; }
@@ -282,7 +282,7 @@ separator (e.g., the comma). You may use it as follows.
 #include <iostream>
 
 int main() {
-  const std::string input = "3,1416 xyz ";
+  std::string input = "3,1416 xyz ";
   double result;
   fast_float::parse_options options{fast_float::chars_format::general, ','};
   auto answer = fast_float::from_chars_advanced(input.data(), input.data() + input.size(), result, options);
@@ -299,9 +299,9 @@ int main() {
 #include <iostream>
 
 int main() {
-  const std::string input = "1d+4";
+  std::string input = "1d+4";
   double result;
-  fast_float::parse_options options{ fast_float::chars_format::fortran };
+  fast_float::parse_options options{fast_float::chars_format::fortran};
   auto answer = fast_float::from_chars_advanced(input.data(), input.data() + input.size(), result, options);
   if ((answer.ec != std::errc()) || ((result != 10000))) { std::cerr << "parsing failure\n"; return EXIT_FAILURE; }
   std::cout << "parsed the number " << result << std::endl;
@@ -316,9 +316,9 @@ int main() {
 #include <iostream>
 
 int main() {
-  const std::string input = "+.1"; // not valid
+  std::string input = "+.1"; // not valid
   double result;
-  fast_float::parse_options options{ fast_float::chars_format::json };
+  fast_float::parse_options options{fast_float::chars_format::json};
   auto answer = fast_float::from_chars_advanced(input.data(), input.data() + input.size(), result, options);
   if (answer.ec == std::errc()) { std::cerr << "should have failed\n"; return EXIT_FAILURE; }
   return EXIT_SUCCESS;
@@ -332,9 +332,9 @@ By default the JSON format does not allow `inf`:
 #include <iostream>
 
 int main() {
-  const std::string input = "inf"; // not valid in JSON
+  std::string input = "inf"; // not valid in JSON
   double result;
-  fast_float::parse_options options{ fast_float::chars_format::json };
+  fast_float::parse_options options{fast_float::chars_format::json};
   auto answer = fast_float::from_chars_advanced(input.data(), input.data() + input.size(), result, options);
   if (answer.ec == std::errc()) { std::cerr << "should have failed\n"; return EXIT_FAILURE; }
   return EXIT_SUCCESS;
@@ -348,9 +348,9 @@ You can allow it with a non-standard `json_or_infnan` variant:
 #include <iostream>
 
 int main() {
-  const std::string input = "inf"; // not valid in JSON but we allow it with json_or_infnan
+  std::string input = "inf"; // not valid in JSON but we allow it with json_or_infnan
   double result;
-  fast_float::parse_options options{ fast_float::chars_format::json_or_infnan };
+  fast_float::parse_options options{fast_float::chars_format::json_or_infnan};
   auto answer = fast_float::from_chars_advanced(input.data(), input.data() + input.size(), result, options);
   if (answer.ec != std::errc() || (!std::isinf(result))) { std::cerr << "should have parsed infinity\n"; return EXIT_FAILURE; }
   return EXIT_SUCCESS;

fuzz/from_chars.cc

@@ -19,7 +19,7 @@ fast_float::chars_format arbitrary_format(FuzzedDataProvider &fdp) {
   return chars_format::general;
 }
 
-extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+extern "C" int LLVMFuzzerTestOneInput(uint8_t const *data, size_t size) {
   FuzzedDataProvider fdp(data, size);
   fast_float::chars_format format = arbitrary_format(fdp);
   double result_d = 0.0;

include/fast_float/ascii_number.h

@@ -45,7 +45,7 @@ fastfloat_really_inline constexpr uint64_t byteswap(uint64_t val) {
 // Read 8 UC into a u64. Truncates UC if not char.
 template <typename UC>
 fastfloat_really_inline FASTFLOAT_CONSTEXPR20 uint64_t
-read8_to_u64(const UC *chars) {
+read8_to_u64(UC const *chars) {
   if (cpp20_and_in_constexpr() || !std::is_same<UC, char>::value) {
     uint64_t val = 0;
     for (int i = 0; i < 8; ++i) {
@@ -65,9 +65,9 @@ read8_to_u64(const UC *chars) {
 
 #ifdef FASTFLOAT_SSE2
 
-fastfloat_really_inline uint64_t simd_read8_to_u64(const __m128i data) {
+fastfloat_really_inline uint64_t simd_read8_to_u64(__m128i const data) {
   FASTFLOAT_SIMD_DISABLE_WARNINGS
-  const __m128i packed = _mm_packus_epi16(data, data);
+  __m128i const packed = _mm_packus_epi16(data, data);
 #ifdef FASTFLOAT_64BIT
   return uint64_t(_mm_cvtsi128_si64(packed));
 #else
@@ -79,26 +79,26 @@ fastfloat_really_inline uint64_t simd_read8_to_u64(const __m128i data) {
   FASTFLOAT_SIMD_RESTORE_WARNINGS
 }
 
-fastfloat_really_inline uint64_t simd_read8_to_u64(const char16_t *chars) {
+fastfloat_really_inline uint64_t simd_read8_to_u64(char16_t const *chars) {
   FASTFLOAT_SIMD_DISABLE_WARNINGS
   return simd_read8_to_u64(
-      _mm_loadu_si128(reinterpret_cast<const __m128i *>(chars)));
+      _mm_loadu_si128(reinterpret_cast<__m128i const *>(chars)));
   FASTFLOAT_SIMD_RESTORE_WARNINGS
 }
 
 #elif defined(FASTFLOAT_NEON)
 
-fastfloat_really_inline uint64_t simd_read8_to_u64(const uint16x8_t data) {
+fastfloat_really_inline uint64_t simd_read8_to_u64(uint16x8_t const data) {
   FASTFLOAT_SIMD_DISABLE_WARNINGS
   uint8x8_t utf8_packed = vmovn_u16(data);
   return vget_lane_u64(vreinterpret_u64_u8(utf8_packed), 0);
   FASTFLOAT_SIMD_RESTORE_WARNINGS
 }
 
-fastfloat_really_inline uint64_t simd_read8_to_u64(const char16_t *chars) {
+fastfloat_really_inline uint64_t simd_read8_to_u64(char16_t const *chars) {
   FASTFLOAT_SIMD_DISABLE_WARNINGS
   return simd_read8_to_u64(
-      vld1q_u16(reinterpret_cast<const uint16_t *>(chars)));
+      vld1q_u16(reinterpret_cast<uint16_t const *>(chars)));
   FASTFLOAT_SIMD_RESTORE_WARNINGS
 }
 
@@ -118,9 +118,9 @@ uint64_t simd_read8_to_u64(UC const *) {
 // credit  @aqrit
 fastfloat_really_inline FASTFLOAT_CONSTEXPR14 uint32_t
 parse_eight_digits_unrolled(uint64_t val) {
-  const uint64_t mask = 0x000000FF000000FF;
-  const uint64_t mul1 = 0x000F424000000064; // 100 + (1000000ULL << 32)
-  const uint64_t mul2 = 0x0000271000000001; // 1 + (10000ULL << 32)
+  uint64_t const mask = 0x000000FF000000FF;
+  uint64_t const mul1 = 0x000F424000000064; // 100 + (1000000ULL << 32)
+  uint64_t const mul2 = 0x0000271000000001; // 1 + (10000ULL << 32)
   val -= 0x3030303030303030;
   val = (val * 10) + (val >> 8); // val = (val * 2561) >> 8;
   val = (((val & mask) * mul1) + (((val >> 16) & mask) * mul2)) >> 32;
@@ -150,20 +150,20 @@ is_made_of_eight_digits_fast(uint64_t val) noexcept {
 // Using this style (instead of is_made_of_eight_digits_fast() then
 // parse_eight_digits_unrolled()) ensures we don't load SIMD registers twice.
 fastfloat_really_inline FASTFLOAT_CONSTEXPR20 bool
-simd_parse_if_eight_digits_unrolled(const char16_t *chars,
+simd_parse_if_eight_digits_unrolled(char16_t const *chars,
                                     uint64_t &i) noexcept {
   if (cpp20_and_in_constexpr()) {
     return false;
   }
 #ifdef FASTFLOAT_SSE2
   FASTFLOAT_SIMD_DISABLE_WARNINGS
-  const __m128i data =
-      _mm_loadu_si128(reinterpret_cast<const __m128i *>(chars));
+  __m128i const data =
+      _mm_loadu_si128(reinterpret_cast<__m128i const *>(chars));
 
   // (x - '0') <= 9
   // http://0x80.pl/articles/simd-parsing-int-sequences.html
-  const __m128i t0 = _mm_add_epi16(data, _mm_set1_epi16(32720));
-  const __m128i t1 = _mm_cmpgt_epi16(t0, _mm_set1_epi16(-32759));
+  __m128i const t0 = _mm_add_epi16(data, _mm_set1_epi16(32720));
+  __m128i const t1 = _mm_cmpgt_epi16(t0, _mm_set1_epi16(-32759));
 
   if (_mm_movemask_epi8(t1) == 0) {
     i = i * 100000000 + parse_eight_digits_unrolled(simd_read8_to_u64(data));
@@ -173,12 +173,12 @@ simd_parse_if_eight_digits_unrolled(const char16_t *chars,
   FASTFLOAT_SIMD_RESTORE_WARNINGS
 #elif defined(FASTFLOAT_NEON)
   FASTFLOAT_SIMD_DISABLE_WARNINGS
-  const uint16x8_t data = vld1q_u16(reinterpret_cast<const uint16_t *>(chars));
+  uint16x8_t const data = vld1q_u16(reinterpret_cast<uint16_t const *>(chars));
 
   // (x - '0') <= 9
   // http://0x80.pl/articles/simd-parsing-int-sequences.html
-  const uint16x8_t t0 = vsubq_u16(data, vmovq_n_u16('0'));
-  const uint16x8_t mask = vcltq_u16(t0, vmovq_n_u16('9' - '0' + 1));
+  uint16x8_t const t0 = vsubq_u16(data, vmovq_n_u16('0'));
+  uint16x8_t const mask = vcltq_u16(t0, vmovq_n_u16('9' - '0' + 1));
 
   if (vminvq_u16(mask) == 0xFFFF) {
     i = i * 100000000 + parse_eight_digits_unrolled(simd_read8_to_u64(data));
@@ -208,7 +208,7 @@ bool simd_parse_if_eight_digits_unrolled(UC const *, uint64_t &) {
 
 template <typename UC, FASTFLOAT_ENABLE_IF(!std::is_same<UC, char>::value) = 0>
 fastfloat_really_inline FASTFLOAT_CONSTEXPR20 void
-loop_parse_if_eight_digits(const UC *&p, const UC *const pend, uint64_t &i) {
+loop_parse_if_eight_digits(UC const *&p, UC const *const pend, uint64_t &i) {
   if (!has_simd_opt<UC>()) {
     return;
   }
@@ -220,7 +220,7 @@ loop_parse_if_eight_digits(const UC *&p, const UC *const pend, uint64_t &i) {
 }
 
 fastfloat_really_inline FASTFLOAT_CONSTEXPR20 void
-loop_parse_if_eight_digits(const char *&p, const char *const pend,
+loop_parse_if_eight_digits(char const *&p, char const *const pend,
                            uint64_t &i) {
   // optimizes better than parse_if_eight_digits_unrolled() for UC = char.
   while ((std::distance(p, pend) >= 8) &&
@@ -259,12 +259,12 @@ template <typename UC> struct parsed_number_string_t {
   bool valid{false};
   bool too_many_digits{false};
   // contains the range of the significant digits
-  span<const UC> integer{};  // non-nullable
-  span<const UC> fraction{}; // nullable
+  span<UC const> integer{};  // non-nullable
+  span<UC const> fraction{}; // nullable
   parse_error error{parse_error::no_error};
 };
 
-using byte_span = span<const char>;
+using byte_span = span<char const>;
 using parsed_number_string = parsed_number_string_t<char>;
 
 template <typename UC>
@@ -328,7 +328,7 @@ parse_number_string(UC const *p, UC const *pend,
   }
   UC const *const end_of_integer_part = p;
   int64_t digit_count = int64_t(end_of_integer_part - start_digits);
-  answer.integer = span<const UC>(start_digits, size_t(digit_count));
+  answer.integer = span<UC const>(start_digits, size_t(digit_count));
   if (uint64_t(fmt & detail::basic_json_fmt)) {
     // at least 1 digit in integer part, without leading zeros
     if (digit_count == 0) {
@@ -341,7 +341,7 @@ parse_number_string(UC const *p, UC const *pend,
   }
 
   int64_t exponent = 0;
-  const bool has_decimal_point = (p != pend) && (*p == decimal_point);
+  bool const has_decimal_point = (p != pend) && (*p == decimal_point);
   if (has_decimal_point) {
     ++p;
     UC const *before = p;
@@ -355,7 +355,7 @@ parse_number_string(UC const *p, UC const *pend,
       i = i * 10 + digit; // in rare cases, this will overflow, but that's ok
     }
     exponent = before - p;
-    answer.fraction = span<const UC>(before, size_t(p - before));
+    answer.fraction = span<UC const>(before, size_t(p - before));
     digit_count -= exponent;
   }
   if (uint64_t(fmt & detail::basic_json_fmt)) {
@@ -446,7 +446,7 @@ parse_number_string(UC const *p, UC const *pend,
       i = 0;
       p = answer.integer.ptr;
       UC const *int_end = p + answer.integer.len();
-      const uint64_t minimal_nineteen_digit_integer{1000000000000000000};
+      uint64_t const minimal_nineteen_digit_integer{1000000000000000000};
       while ((i < minimal_nineteen_digit_integer) && (p != int_end)) {
         i = i * 10 + uint64_t(*p - UC('0'));
         ++p;
@@ -498,7 +498,7 @@ parse_int_string(UC const *p, UC const *pend, T &value,
     ++p;
   }
 
-  const bool has_leading_zeros = p > start_num;
+  bool const has_leading_zeros = p > start_num;
 
   UC const *const start_digits = p;
 

include/fast_float/bigint.h

@@ -43,8 +43,8 @@ template <uint16_t size> struct stackvec {
   uint16_t length{0};
 
   stackvec() = default;
-  stackvec(const stackvec &) = delete;
-  stackvec &operator=(const stackvec &) = delete;
+  stackvec(stackvec const &) = delete;
+  stackvec &operator=(stackvec const &) = delete;
   stackvec(stackvec &&) = delete;
   stackvec &operator=(stackvec &&other) = delete;
 
@@ -423,8 +423,8 @@ struct bigint : pow5_tables<> {
   stackvec<bigint_limbs> vec;
 
   FASTFLOAT_CONSTEXPR20 bigint() : vec() {}
-  bigint(const bigint &) = delete;
-  bigint &operator=(const bigint &) = delete;
+  bigint(bigint const &) = delete;
+  bigint &operator=(bigint const &) = delete;
   bigint(bigint &&) = delete;
   bigint &operator=(bigint &&other) = delete;
 
@@ -473,7 +473,7 @@ struct bigint : pow5_tables<> {
   // positive, this is larger, otherwise they are equal.
   // the limbs are stored in little-endian order, so we
   // must compare the limbs in ever order.
-  FASTFLOAT_CONSTEXPR20 int compare(const bigint &other) const noexcept {
+  FASTFLOAT_CONSTEXPR20 int compare(bigint const &other) const noexcept {
     if (vec.len() > other.vec.len()) {
       return 1;
     } else if (vec.len() < other.vec.len()) {
@@ -527,7 +527,7 @@ struct bigint : pow5_tables<> {
     } else if (!vec.is_empty()) {
       // move limbs
       limb *dst = vec.data + n;
-      const limb *src = vec.data;
+      limb const *src = vec.data;
       std::copy_backward(src, src + vec.len(), dst + vec.len());
       // fill in empty limbs
       limb *first = vec.data;

include/fast_float/decimal_to_binary.h

@@ -20,7 +20,7 @@ namespace fast_float {
 template <int bit_precision>
 fastfloat_really_inline FASTFLOAT_CONSTEXPR20 value128
 compute_product_approximation(int64_t q, uint64_t w) {
-  const int index = 2 * int(q - powers::smallest_power_of_five);
+  int const index = 2 * int(q - powers::smallest_power_of_five);
   // For small values of q, e.g., q in [0,27], the answer is always exact
   // because The line value128 firstproduct = full_multiplication(w,
   // power_of_five_128[index]); gives the exact answer.