Merge branch 'main' of https://github.com/fastfloat/fast_float into fastfloat-main

.github/pull_request_template.md

@@ -1,4 +1,5 @@
-We have benchmarks, please consider running them: see our README for details.
+We have benchmarks, please consider running them: [see our README for details](https://github.com/fastfloat/fast_float/blob/main/README.md#benchmarking). We expect you to run our benchmarks if you make claims with respect to the performance.
+
 
 Our CI tests check formatting automating. If such a test fails, please consider running the bash script:
 

.github/workflows/vs17-ci.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v4
       - name: configure
         run: |
-          cmake -S . -B build -G "${{matrix.gen}}" -A ${{matrix.arch}} -DFASTFLOAT_TEST=ON -DCMAKE_INSTALL_PREFIX:PATH=destination
+          cmake -S . -B build -G "${{matrix.gen}}" -A ${{matrix.arch}} -DFASTFLOAT_BENCHMARKS=ON  -DFASTFLOAT_TEST=ON -DCMAKE_INSTALL_PREFIX:PATH=destination
       - name: build
         run: |
           cmake --build build --verbose --config ${{matrix.cfg}} --parallel

.github/workflows/vs17-clang-ci.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v4
       - name: Configure
         run: |
-          cmake -S . -B build -G "${{matrix.gen}}" -A ${{matrix.arch}} -T ClangCL -DFASTFLOAT_TEST=ON
+          cmake -S . -B build -G "${{matrix.gen}}" -A ${{matrix.arch}} -DFASTFLOAT_BENCHMARKS=ON -T ClangCL -DFASTFLOAT_TEST=ON
       - name: Build
         run: cmake --build build --config ${{matrix.cfg}} --parallel --verbose
       - name: Run basic tests

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.9)
 
-project(fast_float VERSION 8.0.0 LANGUAGES CXX)
+project(fast_float VERSION 8.0.2 LANGUAGES CXX)
 set(FASTFLOAT_CXX_STANDARD 11 CACHE STRING "the C++ standard to use for fastfloat")
 set(CMAKE_CXX_STANDARD ${FASTFLOAT_CXX_STANDARD})
 option(FASTFLOAT_TEST "Enable tests" OFF)
@@ -55,11 +55,15 @@ if(FASTFLOAT_SANITIZE)
     target_link_libraries(fast_float INTERFACE -fuse-ld=gold)
   endif()
 endif()
-if(MSVC_VERSION GREATER 1910)
+
+include(CheckCXXCompilerFlag)
+unset(FASTFLOAT_COMPILER_SUPPORTS_PERMISSIVE)
+CHECK_CXX_COMPILER_FLAG(/permissive- FASTFLOAT_COMPILER_SUPPORTS_PERMISSIVE)
+
+if(FASTFLOAT_COMPILER_SUPPORTS_PERMISSIVE)
   target_compile_options(fast_float INTERFACE /permissive-)
 endif()
 
-
 if(FASTFLOAT_INSTALL)
   include(CMakePackageConfigHelpers)
 

README.md

@@ -472,7 +472,7 @@ abseil                                  :   430.45 MB/s (+/- 2.2 %)    20.52 Mfl
 fastfloat                               :  1042.38 MB/s (+/- 9.9 %)    49.68 Mfloat/s
 ```
 
-See the [Benchmarking](#benchmarking) Section for instructions on how to run our benchmarks.
+See the [Benchmarking](#benchmarking) section for instructions on how to run our benchmarks.
 
 ## Video
 
@@ -498,7 +498,7 @@ sufficiently recent version of CMake (3.11 or better at least):
 FetchContent_Declare(
   fast_float
   GIT_REPOSITORY https://github.com/fastfloat/fast_float.git
-  GIT_TAG tags/v8.0.0
+  GIT_TAG tags/v8.0.2
   GIT_SHALLOW TRUE)
 
 FetchContent_MakeAvailable(fast_float)
@@ -514,7 +514,7 @@ You may also use [CPM](https://github.com/cpm-cmake/CPM.cmake), like so:
 CPMAddPackage(
   NAME fast_float
   GITHUB_REPOSITORY "fastfloat/fast_float"
-  GIT_TAG v8.0.0)
+  GIT_TAG v8.0.2)
 ```
 
 ## Using as single header
@@ -526,7 +526,7 @@ if desired as described in the command line help.
 
 You may directly download automatically generated single-header files:
 
-<https://github.com/fastfloat/fast_float/releases/download/v8.0.0/fast_float.h>
+<https://github.com/fastfloat/fast_float/releases/download/v8.0.2/fast_float.h>
 
 ## Benchmarking
 
@@ -551,6 +551,14 @@ in some cases:
 sudo ./build/benchmarks/realbenchmark
 ```
 
+If you have a text file containing one number per line (`myfile.txt`), you can run a benchmark over it like so:
+```
+cmake -B build -D FASTFLOAT_BENCHMARKS=ON
+cmake --build build
+./build/benchmarks/realbenchmark myfile.txt
+```
+
+
 ## Packages
 
 * The fast_float library is part of the [Conan package

benchmarks/benchmark.cpp

@@ -282,7 +282,11 @@ int main(int argc, char **argv) {
 #endif
   }
 #endif
-
+  if (argc > 1) {
+    fileload(argv[1]);
+    return EXIT_SUCCESS;
+  }
   fileload(std::string(BENCHMARK_DATA_DIR) + "/canada.txt");
   fileload(std::string(BENCHMARK_DATA_DIR) + "/mesh.txt");
+  return EXIT_SUCCESS;
 }

include/fast_float/ascii_number.h

@@ -289,7 +289,7 @@ report_parse_error(UC const *p, parse_error error) noexcept {
 
 // Assuming that you use no more than 19 digits, this will
 // parse an ASCII string.
-template <typename UC>
+template <bool basic_json_fmt, typename UC>
 fastfloat_really_inline FASTFLOAT_CONSTEXPR20 parsed_number_string_t<UC>
 parse_number_string(UC const *p, UC const *pend,
                     parse_options_t<UC> const &options) noexcept {
@@ -314,7 +314,8 @@ parse_number_string(UC const *p, UC const *pend,
         return report_parse_error<UC>(p,
                                       parse_error::missing_integer_after_sign);
       }
-    } else {
+    }
+    else {
       if (!is_integer(*p) &&
           (*p !=
            options.decimal_point)) { // a sign must be followed by an integer or the dot
@@ -340,8 +341,7 @@ 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<UC const>(start_digits, size_t(digit_count));
-#ifndef FASTFLOAT_ONLY_POSITIVE_C_NUMBER_WO_INF_NAN
+  FASTFLOAT_IF_CONSTEXPR17(basic_json_fmt) {
-  if (uint64_t(options.format & detail::basic_json_fmt)) {
     // at least 1 digit in integer part, without leading zeros
     if (digit_count == 0) {
       return report_parse_error<UC>(p, parse_error::no_digits_in_integer_part);
@@ -351,7 +351,6 @@ parse_number_string(UC const *p, UC const *pend,
                                     parse_error::leading_zeros_in_integer_part);
     }
   }
-#endif
 
   int64_t exponent = 0;
   bool const has_decimal_point = (p != pend) && (*p == options.decimal_point);
@@ -371,17 +370,14 @@ parse_number_string(UC const *p, UC const *pend,
     answer.fraction = span<UC const>(before, size_t(p - before));
     digit_count -= exponent;
   }
-#ifndef FASTFLOAT_ONLY_POSITIVE_C_NUMBER_WO_INF_NAN
+  FASTFLOAT_IF_CONSTEXPR17(basic_json_fmt) {
-  if (uint64_t(options.format & detail::basic_json_fmt)) {
     // at least 1 digit in fractional part
     if (has_decimal_point && exponent == 0) {
       return report_parse_error<UC>(p,
                                     parse_error::no_digits_in_fractional_part);
     }
-  } else
+  }
-#endif
+  else if (digit_count == 0) { // we must have encountered at least one integer!
-         if (digit_count ==
-             0) { // we must have encountered at least one integer!
     return report_parse_error<UC>(p, parse_error::no_digits_in_mantissa);
   }
   int64_t exp_number = 0; // explicit exponential part

include/fast_float/constexpr_feature_detect.h

@@ -33,6 +33,12 @@
 #define FASTFLOAT_HAS_BYTESWAP 0
 #endif
 
+#if defined(__cpp_if_constexpr) && __cpp_if_constexpr >= 201606L
+#define FASTFLOAT_IF_CONSTEXPR17(x) if constexpr (x)
+#else
+#define FASTFLOAT_IF_CONSTEXPR17(x) if (x)
+#endif
+
 // Testing for relevant C++20 constexpr library features
 #if FASTFLOAT_HAS_IS_CONSTANT_EVALUATED && FASTFLOAT_HAS_BIT_CAST &&           \
     defined(__cpp_lib_constexpr_algorithms) &&                                 \

include/fast_float/float_common.h

@@ -17,7 +17,7 @@
 
 #define FASTFLOAT_VERSION_MAJOR 8
 #define FASTFLOAT_VERSION_MINOR 0
-#define FASTFLOAT_VERSION_PATCH 0
+#define FASTFLOAT_VERSION_PATCH 2
 
 #define FASTFLOAT_STRINGIZE_IMPL(x) #x
 #define FASTFLOAT_STRINGIZE(x) FASTFLOAT_STRINGIZE_IMPL(x)

include/fast_float/parse_number.h

@@ -324,7 +324,12 @@ from_chars_float_advanced(UC const *first, UC const *last, T &value,
   FASTFLOAT_ASSUME(first < last);
 #endif
   parsed_number_string_t<UC> const pns =
-      parse_number_string<UC>(first, last, options);
+#ifndef FASTFLOAT_ONLY_POSITIVE_C_NUMBER_WO_INF_NAN
+      uint64_t(options.format & detail::basic_json_fmt)
+          ? parse_number_string<true, UC>(first, last, options)
+          :
+#endif
+      parse_number_string<false, UC>(first, last, options);
   if (!pns.valid) {
 #ifndef FASTFLOAT_ONLY_POSITIVE_C_NUMBER_WO_INF_NAN
     if (uint64_t(options.format & chars_format::no_infnan)) {

tests/json_fmt.cpp

@@ -131,7 +131,7 @@ int main() {
   for (std::size_t i = 0; i < reject.size(); ++i) {
     auto const &f = reject[i].input;
     auto const &expected_reason = reject[i].reason;
-    auto answer = fast_float::parse_number_string(
+    auto answer = fast_float::parse_number_string<true>(
         f.data(), f.data() + f.size(),
         fast_float::parse_options(
             fast_float::chars_format::json |