code:

    res = get_bytes_in_next_portion4(buf)
Boost.Python.ArgumentError: Python argument types in
    _cfastproto.get_bytes_in_next_portion4(str)
did not match C++ signature:
    get_bytes_in_next_portion4(class boost::shared_array<char>)
  

code:

    // Convert obj_ptr into a QString
    static void construct(
    PyObject* obj_ptr,
    boost::python::converter::rvalue_from_python_stage1_data* data)
    {
      // Extract the character data from the python string
      const char* value = PyString_AsString(obj_ptr);

      // Verify that obj_ptr is a string (should be ensured by convertible())
      assert(value);

      // Grab pointer to memory into which to construct the new QString
      void* storage = (
        (boost::python::converter::rvalue_from_python_storage<QString>*)
        data)->storage.bytes;


      // in-place construct the new QString using the character data
      // extraced from the python object
      new (storage) QString(value);

      // Stash the memory chunk pointer for later use by boost.python
      data->convertible = storage;
    }

code:

    int get_bytes_in_next_portion3(std::string buf)
    {
        int i;
        int len = buf.length();
        for(i=0;i<len;i++)
            if ((buf[i] & 128) != 0)
                break;
        return i;
    }

    int get_bytes_in_next_portion5(PyObject *py_str)
    {
    	if (!PyString_Check(py_str))
    		PyErr_SetString(PyExc_RuntimeError, "not str!");

    	Py_INCREF(py_str);

    	int len = PyString_GET_SIZE(py_str);
    	char *ptr = PyString_AS_STRING(py_str);
        int i;
        //for(i=0;buf[i] != '\0';i++)
        for(i=0; i < len ;i++)
            if (((ptr[i]) & 128) != 0)
                break;
    	Py_DECREF(py_str);
        return i;
    }
   int get_bytes_in_next_portion4(PyObject *py_str)
    {
    	Py_INCREF(py_str);
    	int len = PyString_GET_SIZE(py_str);
    	char *ptr = PyString_AS_STRING(py_str);
        for(i=0; i < len ;i++)
            if (((ptr[i]) & 128) != 0)
                break;
    	Py_DECREF(py_str);
        return i;
    }   

BOOST_PYTHON_MODULE (_csomemodule)
{
    using namespace boost::python;

    def("get_bytes_in_next_portion4", get_bytes_in_next_portion4);
}

В ответ на:

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[2]done in 125,312,500 nsec // на питоне
[3]done in 2,812,500 nsec // std::string
[4]done in 2,031,250 nsec
[5]done in 1,953,125 nsec // ???? добавили проверку на строку, стала работать быстрее.

[6]done in 4,296,875 nsec
[7]done in 5,078,125 nsec

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