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Fix undefined behavior

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This commit is contained in:
Howard Hinnant
2014-12-23 16:12:56 -05:00
committed by Nik Bougalis
parent 1d6721d345
commit 5100eadf12
1 changed files with 4 additions and 2 deletions
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6
beast/strings/impl/String.cpp
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@@ -37,6 +37,7 @@
#include <algorithm> #include <algorithm>
#include <atomic> #include <atomic>
#include <cstring>
namespace beast { namespace beast {
@@ -240,8 +241,9 @@ private:
static inline StringHolder* bufferFromText (const CharPointerType text) noexcept static inline StringHolder* bufferFromText (const CharPointerType text) noexcept
{ {
// (Can't use offsetof() here because of warnings about this not being a POD) // (Can't use offsetof() here because of warnings about this not being a POD)
return reinterpret_cast <StringHolder*> (reinterpret_cast <char*> (text.getAddress()) auto const text_offset = reinterpret_cast<char*>(empty.text) - reinterpret_cast<char*>(&empty);
- (reinterpret_cast <size_t> (reinterpret_cast <StringHolder*> (1)->text) - 1)); auto const tmp = reinterpret_cast<char*>(text.getAddress()) - text_offset;
return static_cast<StringHolder*>(std::memmove(tmp, tmp, 0));
} }
}; };