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[buddy] Enable C++11 and add a move constructor/assignment operator.

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* configure.ac: Enable C++11 mode.
* src/bdd.h: Use noexport, and add a move constructor and
move assignment operator.  The move version of these method
do not have to increment the reference counter, saving time.
On a small test run, this change saved 24% of the calls to
bdd_addref_nc().
This commit is contained in:
Alexandre Duret-Lutz 2014-01-06 21:28:46 +01:00
parent b37dc0bc90
commit bd6d88db96
3 changed files with 91 additions and 16 deletions
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35
buddy/configure.ac
View file

@ -43,6 +43,41 @@ if test x$enable_warnings = xyes; then
CF_GCC_WARNINGS
fi
# Turn on C++11 support
AC_LANG(C++)
m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody],
[AC_LANG_SOURCE([#include <memory>
#include <string>
template <typename T>
struct check
{
static_assert(sizeof(int) <= sizeof(T), "not big enough");
};
typedef check<check<bool>> right_angle_brackets;
auto f = std::make_shared<std::string>("shared_ptr");
int a;
decltype(a) b;
typedef check<int> check_type;
check_type c;
check_type&& cr = static_cast<check_type&&>(c);
auto d = a;
])])
for f in -std=c++11 '-std=c++11 -stdlib=libc++' -std=c++0x
do
AX_CHECK_COMPILE_FLAG([$f], [CXXFLAGS="$CXXFLAGS $f" stdpass=true], [], [],
[_AX_CXX_COMPILE_STDCXX_11_testbody])
${stdpass-false} && break
done
if ! "${stdpass-false}"; then
AC_ERROR([unable to turn on C++11 mode with this compiler])
fi
AC_CONFIG_HEADERS([config.h])