c++ - Python bool 转换为 C++ (pybind11)

Question

我正在尝试将 python bool 值转换为 C++ bool 值，以便可以将其用于比较，但未能成功。

这是我到目前为止的代码(注释掉以前的试验以供引用)。任何帮助将不胜感激。到目前为止，它应该打印“True”和“False”，但我无法让它在 C++ if 语句中正确求值。

py::object mwparser = py::module::import("mwparserfromhell");
py::object code = mwparser.attr("parse")(py::str(text));
py::object filtered = code.attr("filter_templates")();

for(auto temp : filtered) {
    //auto type = template_figure_type(temp.attr("name"));
    auto type = template_figure_type(py::str(temp.attr("name")));
   // py::print("G ");
    //py::print(type);
 //   auto type = "";
    if(type != ""){
        try {
            //list.append(type);
            //return list;
            //py::print(py::str(type));

            py::object f = temp.attr("has")("link");
            py::print(py::str(f)); //displays "True" and "False" when it should
            //PyObject *t = Py_True;
           // int tr = PyObject_IsTrue(f);

           // if(py::str(f) == py::str("False")) {
            if(py::str(f).is(py::str("True"))) {
            //if(temp.attr("has")("link")) {
            //if(py::str(f) == py::str("True")){
           // if(0){
                temp.attr("remove")("link");
                bContent_changed = true;
                list.append(temp);
            }
            else {
                py::print("NO");
            }
        } catch (std::domain_error) {
            throw std::domain_error("");
        }
    }

编辑:

if(f == Py_True){

似乎有效，但已弃用。当我尝试使用建议的“f.is(Py_True)”时，它会产生错误 error: reference to type 'const
pybind11::detail::object_api<pybind11::handle>' could not bind to an
rvalue of type 'PyObject *' (aka '_object *')
if(f.is(Py_True)){
^~~~~~~


Answer 1

看来这可以通过对上述代码片段进行以下更改来解决

f.is(Py_True)

应该是

if(py::str(f).is(py::str(Py_True)))

希望这能帮助其他可能有同样问题的人。重要的是要注意，虽然已弃用，但“==”比较 (f == Py_True) 仍然有效(暂时)。

对于那些好奇的(功能)更新代码如下:

py::object mwparser = py::module::import("mwparserfromhell");
py::object code = mwparser.attr("parse")(py::str(text));
py::object filtered = code.attr("filter_templates")();

for(auto temp : filtered) {
    auto type = template_figure_type(py::str(temp.attr("name")));
    if(type != ""){
        try {

            py::object f = temp.attr("has")("link");
            py::print(py::str(f)); //displays "True" and "False" when it should
              if(py::str(f).is(py::str(Py_True))){
                temp.attr("remove")("link");
                bContent_changed = true;
                list.append(temp);
            }
            else {
                py::print("NO");
            }
        } catch (std::domain_error) {
            throw std::domain_error("");
        }
}