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Re: [patch] Make vector::at() assertion message more useful (try #2)

On 9/23/13 7:54 AM, Paolo Carlini wrote:

Testing this patch:
In fact, however, that unsigned long long instantiation isn't
*unconditionally* available, see


I think we have to use
unsigned long as a fall back controlled by the same macro. And please
add a comment explaining those contortions having to do with the
available instantiations. Patch pre-approved.

Does this look right?

Index: libstdc++-v3/src/c++11/
--- libstdc++-v3/src/c++11/	(revision 202832)
+++ libstdc++-v3/src/c++11/	(working copy)
@@ -69,11 +69,17 @@
   // Returns number of characters appended, or -1 if BUFSIZE is too small.
   int __concat_size_t(char *__buf, size_t __bufsize, size_t __val)
+    // __int_to_char is explicitly instantiated and available only for
+    // some, but not all, types.
+    unsigned long long __val2 = __val;
+    unsigned long __val2 = __val;
     // Long enough for decimal representation.
-    unsigned long long __val_ull = __val;
-    int __ilen = 3 * sizeof(__val_ull);
+    int __ilen = 3 * sizeof(__val2);
     char *__cs = static_cast<char*>(__builtin_alloca(__ilen));
-    size_t __len = std::__int_to_char(__cs + __ilen, __val_ull,
+    size_t __len = std::__int_to_char(__cs + __ilen, __val2,
 				      std::ios_base::dec, true);
     if (__bufsize < __len)

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