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#51 Use static StringFlagDestructor to destruct string objects allocated by placement new

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This commit is contained in:
Andreas Schuh 2016-02-19 12:59:05 +00:00
parent 3f968fc16b
commit 7a69001868
1 changed files with 21 additions and 0 deletions
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21
src/gflags.h.in
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@ -538,6 +538,26 @@ inline clstring* dont_pass0toDEFINE_string(char *stringspot,
}
inline clstring* dont_pass0toDEFINE_string(char *stringspot,
int value);
// Auxiliary class used to explicitly call destructor of string objects
// allocated using placement new during static program deinitialization.
// The destructor MUST be an inline function such that the explicit
// destruction occurs in the same compilation unit as the placement new.
class StringFlagDestructor {
void *current_storage_;
void *defvalue_storage_;
public:
StringFlagDestructor(void *current, void *defvalue)
: current_storage_(current), defvalue_storage_(defvalue) {}
~StringFlagDestructor() {
reinterpret_cast<clstring*>(current_storage_ )->~clstring();
reinterpret_cast<clstring*>(defvalue_storage_)->~clstring();
}
};
} // namespace fLS
// We need to define a var named FLAGS_no##name so people don't define
@ -557,6 +577,7 @@ inline clstring* dont_pass0toDEFINE_string(char *stringspot,
static GFLAGS_NAMESPACE::FlagRegisterer o_##name( \
#name, "string", MAYBE_STRIPPED_HELP(txt), __FILE__, \
s_##name[0].s, new (s_##name[1].s) clstring(*FLAGS_no##name)); \
static StringFlagDestructor d_##name(s_##name[0].s, s_##name[1].s); \
extern GFLAGS_DLL_DEFINE_FLAG clstring& FLAGS_##name; \
using fLS::FLAGS_##name; \
clstring& FLAGS_##name = *FLAGS_no##name; \