harmonize ifdef checks

Author: dalle

include/fast_float/float_common.h

@@ -221,10 +221,10 @@ template <typename T>
 struct is_supported_float_type
     : std::integral_constant<bool, std::is_same<T, float>::value ||
                                        std::is_same<T, double>::value
-#if __STDCPP_FLOAT32_T__
+#ifdef __STDCPP_FLOAT32_T__
                                        || std::is_same<T, std::float32_t>::value
 #endif
-#if __STDCPP_FLOAT64_T__
+#ifdef __STDCPP_FLOAT64_T__
                                        || std::is_same<T, std::float64_t>::value
 #endif
                              > {

include/fast_float/parse_number.h

@@ -145,7 +145,7 @@ template <typename T> struct from_chars_caller {
   }
 };
 
-#if __STDCPP_FLOAT32_T__ == 1
+#ifdef __STDCPP_FLOAT32_T__
 template <> struct from_chars_caller<std::float32_t> {
   template <typename UC>
   FASTFLOAT_CONSTEXPR20 static from_chars_result_t<UC>
@@ -162,7 +162,7 @@ template <> struct from_chars_caller<std::float32_t> {
 };
 #endif
 
-#if __STDCPP_FLOAT64_T__ == 1
+#ifdef __STDCPP_FLOAT64_T__
 template <> struct from_chars_caller<std::float64_t> {
   template <typename UC>
   FASTFLOAT_CONSTEXPR20 static from_chars_result_t<UC>

tests/fixedwidthtest.cpp

@@ -12,7 +12,7 @@
 int main() {
   // Write some testcases for the parsing of floating point numbers in the
   // float32_t type. We use the from_chars function defined in this library.
-#if __STDCPP_FLOAT32_T__
+#ifdef __STDCPP_FLOAT32_T__
   std::vector<std::float32_t> const float32_test_expected{
       123.456f, -78.9f, 0.0001f, 3.40282e+038f};
   std::vector<std::string_view> const float32_test{"123.456", "-78.9", "0.0001",
@@ -37,7 +37,7 @@ int main() {
   std::cout << "No std::float32_t type available." << std::endl;
 #endif
 
-#if __STDCPP_FLOAT64_T__
+#ifdef __STDCPP_FLOAT64_T__
   // Test cases for std::float64_t
   std::vector<std::float64_t> const float64_test_expected{
       1.23e4, -5.67e-8, 1.7976931348623157e+308, -1.7976931348623157e+308};