int main()
{
  400bba:       55                      push   %rbp
  400bbb:       48 89 e5                mov    %rsp,%rbp
  400bbe:       53                      push   %rbx
  400bbf:       48 83 ec 18             sub    $0x18,%rsp
    auto ptr = std::shared_ptr<int>(new int);
  400bc3:       bf 04 00 00 00          mov    $0x4,%edi
  400bc8:       e8 33 fe ff ff          callq  400a00 <_Znwm@plt>
  400bcd:       48 89 c2                mov    %rax,%rdx
  400bd0:       48 8d 45 e0             lea    -0x20(%rbp),%rax
  400bd4:       48 89 d6                mov    %rdx,%rsi
  400bd7:       48 89 c7                mov    %rax,%rdi
  400bda:       e8 ff 00 00 00          callq  400cde <_ZNSt10shared_ptrIiEC1IiEEPT_>
    *ptr = 100;
  400bdf:       48 8d 45 e0             lea    -0x20(%rbp),%rax
  400be3:       48 89 c7                mov    %rax,%rdi
  400be6:       e8 43 01 00 00          callq  400d2e <_ZNKSt12__shared_ptrIiLN9__gnu_cxx12_Lock_policyE2EEdeEv>
  400beb:       c7 00 64 00 00 00       movl   $0x64,(%rax)
    std::cout << *ptr << std::endl;
  400bf1:       48 8d 45 e0             lea    -0x20(%rbp),%rax
  400bf5:       48 89 c7                mov    %rax,%rdi
  400bf8:       e8 31 01 00 00          callq  400d2e <_ZNKSt12__shared_ptrIiLN9__gnu_cxx12_Lock_policyE2EEdeEv>
  400bfd:       8b 00                   mov    (%rax),%eax
  400bff:       89 c6                   mov    %eax,%esi
  400c01:       bf a0 20 60 00          mov    $0x6020a0,%edi
  400c06:       e8 35 fd ff ff          callq  400940 <_ZNSolsEi@plt>
  400c0b:       be d0 09 40 00          mov    $0x4009d0,%esi
  400c10:       48 89 c7                mov    %rax,%rdi
  400c13:       e8 98 fd ff ff          callq  4009b0 <_ZNSolsEPFRSoS_E@plt>
    return 0;
  400c18:       bb 00 00 00 00          mov    $0x0,%ebx
    auto ptr = std::shared_ptr<int>(new int);
  400c1d:       48 8d 45 e0             lea    -0x20(%rbp),%rax
  400c21:       48 89 c7                mov    %rax,%rdi
  400c24:       e8 99 00 00 00          callq  400cc2 <_ZNSt10shared_ptrIiED1Ev>
  400c29:       89 d8                   mov    %ebx,%eax
  400c2b:       eb 1a                   jmp    400c47 <main+0x8d>
  400c2d:       48 89 c3                mov    %rax,%rbx
  400c30:       48 8d 45 e0             lea    -0x20(%rbp),%rax
  400c34:       48 89 c7                mov    %rax,%rdi
  400c37:       e8 86 00 00 00          callq  400cc2 <_ZNSt10shared_ptrIiED1Ev>
  400c3c:       48 89 d8                mov    %rbx,%rax
  400c3f:       48 89 c7                mov    %rax,%rdi
  400c42:       e8 c9 fd ff ff          callq  400a10 <_Unwind_Resume@plt>
}
  400c47:       48 83 c4 18             add    $0x18,%rsp
  400c4b:       5b                      pop    %rbx
  400c4c:       5d                      pop    %rbp
  400c4d:       c3                      retq