Tests: skip the parse() allocation sweep with MSVC iterator debugging

With _ITERATOR_DEBUG_LEVEL > 0 (MSVC STL debug builds, clang-cl), containers
allocate inside noexcept functions, so a failing allocation terminates the
program: "test case CRASHED: Terminate handler called" in the sax_parse
subcase of #5985. The sweep test of #6000 has the same guard.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

include/nlohmann/detail/view/builder.hpp

@@ -1168,20 +1168,19 @@ indent_done:
             if (negative)
             {
                 ++p;
-                if (NLOHMANN_VIEW_UNLIKELY(cur() < '0' || cur() > '9'))
-                {
-                    return fail(error_code::number_after_minus);
-                }
             }
             const unsigned char* const int_start = p;
             if (cur() == '0')
             {
                 ++p;
             }
+            else if (NLOHMANN_VIEW_LIKELY(cur() >= '1' && cur() <= '9'))
+            {
+                p = skip_digits(p + 1, e);
+            }
             else
             {
-                // (a digit: the dispatch or the check after the sign saw it)
+                return fail(error_code::number_after_minus);
-                p = skip_digits(p + 1, e);
             }
             const auto int_digits = static_cast<std::size_t>(p - int_start);
             std::size_t frac_digits = 0;

single_include/nlohmann/json_view.hpp

@@ -2473,20 +2473,19 @@ indent_done:
             if (negative)
             {
                 ++p;
-                if (NLOHMANN_VIEW_UNLIKELY(cur() < '0' || cur() > '9'))
-                {
-                    return fail(error_code::number_after_minus);
-                }
             }
             const unsigned char* const int_start = p;
             if (cur() == '0')
             {
                 ++p;
             }
+            else if (NLOHMANN_VIEW_LIKELY(cur() >= '1' && cur() <= '9'))
+            {
+                p = skip_digits(p + 1, e);
+            }
             else
             {
-                // (a digit: the dispatch or the check after the sign saw it)
+                return fail(error_code::number_after_minus);
-                p = skip_digits(p + 1, e);
             }
             const auto int_digits = static_cast<std::size_t>(p - int_start);
             std::size_t frac_digits = 0;

tests/src/unit-allocator.cpp

@@ -1026,7 +1026,10 @@ TEST_CASE("insert() provides its documented exception guarantees (#5986)")
 }
 #endif
 
-#if !defined(JSON_NOEXCEPTION)
+// the no-exceptions CI job has no std::bad_alloc to catch; with iterator
+// debugging (MSVC STL debug builds) containers allocate inside noexcept
+// functions, so failing an allocation there terminates the program
+#if !defined(JSON_NOEXCEPTION) && !(defined(_ITERATOR_DEBUG_LEVEL) && _ITERATOR_DEBUG_LEVEL > 0)
 namespace
 {
 // the allocation numbered sweep_fail_at (counted from 1) throws; 0 never fails

tests/src/unit-locale-cpp.cpp

@@ -505,8 +505,8 @@ struct locale_switching_token
 {
     using value_type = char;
 
-    locale_switching_token(std::string text_, std::string switch_to_)
+    locale_switching_token(std::string text_, const char* switch_to_)
-        : text(std::move(text_)), switch_to(std::move(switch_to_))
+        : text(std::move(text_)), switch_to(switch_to_)
     {}
 
     std::size_t size() const
@@ -523,13 +523,13 @@ struct locale_switching_token
     {
         if (!switched)
         {
-            switched = std::setlocale(LC_NUMERIC, switch_to.c_str()) != nullptr;
+            switched = std::setlocale(LC_NUMERIC, switch_to) != nullptr;
         }
         return &text[0];
     }
 
     std::string text;
-    std::string switch_to;
+    const char* switch_to;
     bool switched = false;
 };