Dave Zarzycki showed how the efficiency of shared_ptr could be significantly

increased.  The following program is running 49% faster:

#include <iostream>
#include <memory>
#include <chrono>
#include <vector>
#include "chrono_io"

int main()
{
    typedef std::chrono::high_resolution_clock Clock;
    Clock::time_point t0 = Clock::now();
    {
        std::shared_ptr<int> p(new int (1));
        std::vector<std::shared_ptr<int> > v(1000000, p);
        v.insert(v.begin(), p);
        v.insert(v.begin(), p);
        v.insert(v.begin(), p);
        v.insert(v.begin(), p);
    }
    Clock::time_point t1 = Clock::now();
    std::cout << (t1-t0) << '\n';
}

llvm-svn: 119388

1 files changed, 1 insertions, 1 deletions

diff --git a/libcxx/include/memory b/libcxx/include/memory
index c01615469bf..4752ba0007d 100644
--- a/libcxx/include/memory
+++ b/libcxx/include/memory
@@ -2535,7 +2535,7 @@ public:
         : __shared_owners_(__refs) {}
 
     void __add_shared();
-    void __release_shared();
+    bool __release_shared();
     _LIBCPP_INLINE_VISIBILITY
     long use_count() const {return __shared_owners_ + 1;}
 };