C++11. Duh.

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.9)
 
 project(fast_float VERSION 0.1.0 LANGUAGES CXX)
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 

README.md

@@ -5,7 +5,7 @@ functions for `float` and `double` types.  These functions convert ASCII strings
 decimal values (e.g., `1.3e10`) into binary types. We provide exact rounding (including
 round to even). In our experience, these `fast_float` functions are faster than any other comparable number-parsing functions. They provide a performance similar to that of the [fast_double_parser](https://github.com/lemire/fast_double_parser) but using an novel algorithm reworked from the ground up, and while offering an API more in line with the expectations of C++ programmers.
 
-Specifically, `fast_float` provides the following two functions with a C++17-like syntax:
+Specifically, `fast_float` provides the following two functions 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, ...);

include/fast_float/float_common.h

@@ -133,6 +133,12 @@ struct decimal {
   uint8_t digits[max_digits];
 };
 
+constexpr static double powers_of_ten_double[] = {
+    1e0,  1e1,  1e2,  1e3,  1e4,  1e5,  1e6,  1e7,  1e8,  1e9,  1e10, 1e11,
+    1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22};
+constexpr static float powers_of_ten_float[] = {
+    1e0,  1e1,  1e2,  1e3,  1e4,  1e5,  1e6,  1e7,  1e8,  1e9,  1e10};
+
 template <typename T>
 struct binary_format {
   static constexpr int mantissa_explicit_bits();
@@ -145,11 +151,6 @@ struct binary_format {
   static constexpr int min_exponent_round_to_even();
   static constexpr uint64_t max_mantissa_fast_path();
   static constexpr T exact_power_of_ten(int64_t power);
-  constexpr static double powers_of_ten_double[] = {
-    1e0,  1e1,  1e2,  1e3,  1e4,  1e5,  1e6,  1e7,  1e8,  1e9,  1e10, 1e11,
-    1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22};
-  constexpr static float powers_of_ten_float[] = {
-    1e0,  1e1,  1e2,  1e3,  1e4,  1e5,  1e6,  1e7,  1e8,  1e9,  1e10};
 };
 
 template <>