Экспортировать объект типа функции в список ⇐ C++

[Anonymous]

Я пытаюсь создать функцию с помощью cpp11, которая экспортирует список с тремя аргументами:
list myCallBack::myRepresentation() const {
writable::list out;

out.push_back({"x"_nm = writable::integers(x)});
out.push_back({"y"_nm = writable::doubles(y)});
out.push_back({"z"_nm = as_sexp(z)});

return out;
}

поскольку z имеет тип cpp11::function, я не уверен, как правильно включить его в свой список.
Я получаю ошибку:
error: no matching function for call to ‘as_sexp(cpp11::function&)’

Я пробовал разные комбинации, которые приводили к одной и той же ошибке.
_nm означает «именный» в официальном синтаксисе cpp11 (https://cpp11.r-lib.org/articles/cpp11.html#vectors-stl)
writable:: также является частью официальной документации и должен быть объявлен для записи чего-либо на лету или когда нам понадобится отредактировать этот объект позже (в противном случае объект доступен только для чтения, как это было объяснено здесь https: //cpp11.r-lib.org/articles/converting.html#vectors)
Полный журнал ошибок
Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -UNDEBUG -Wall -pedantic -g -O0 -fdiagnostics-color=always -c callback_registry.cpp -o callback_registry.o
In file included from /home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11.hpp:3,
from callback_registry.h:4,
from callback_registry.cpp:6:
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/R.hpp:12: warning: "STRICT_R_HEADERS" redefined
12 | #define STRICT_R_HEADERS
|
: note: this is the location of the previous definition
In file included from /home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/r_vector.hpp:19,
from /home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/list.hpp:9,
from /home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/data_frame.hpp:12,
from /home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11.hpp:7,
from callback_registry.h:4,
from callback_registry.cpp:6:
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/named_arg.hpp: In instantiation of ‘cpp11::named_arg& cpp11::named_arg::operator=(T) [with T = cpp11::function]’:
callback_registry.cpp:198:33: required from here
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/named_arg.hpp:22:21: error: no matching function for call to ‘as_sexp(cpp11::function&)’
22 | value_ = as_sexp(rhs);
| ~~~~~~~^~~~~
In file included from /home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11.hpp:5,
from callback_registry.h:4,
from callback_registry.cpp:6:
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:207:29: note: candidate: ‘template cpp11::enable_if_integral cpp11::as_sexp(T)’
207 | enable_if_integral as_sexp(T from) {
| ^~~~~~~
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:207:29: note: template argument deduction/substitution failed:
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp: In substitution of ‘template using enable_if_t = typename std::enable_if::type [with bool C = false; R = SEXPREC*]’:
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:50:7: required by substitution of ‘template using enable_if_integral = cpp11::enable_if_t [with T = cpp11::function; R = SEXPREC*]’
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:207:29: required by substitution of ‘template cpp11::enable_if_integral cpp11::as_sexp(T) [with T = cpp11::function]’
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/named_arg.hpp:22:21: required from ‘cpp11::named_arg& cpp11::named_arg::operator=(T) [with T = cpp11::function]’
callback_registry.cpp:198:33: required from here
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:16:7: error: no type named ‘type’ in ‘struct std::enable_if’
16 | using enable_if_t = typename std::enable_if::type;
| ^~~~~~~~~~~
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/named_arg.hpp: In instantiation of ‘cpp11::named_arg& cpp11::named_arg::operator=(T) [with T = cpp11::function]’:
callback_registry.cpp:198:33: required from here
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:212:35: note: candidate: ‘template cpp11::enable_if_floating_point cpp11::as_sexp(T)’
212 | enable_if_floating_point as_sexp(T from) {
| ^~~~~~~
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:212:35: note: template argument deduction/substitution failed:
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp: In substitution of ‘template using enable_if_floating_point = typename std::enable_if::type [with T = cpp11::function; R = SEXPREC*]’:
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:212:35: required by substitution of ‘template cpp11::enable_if_floating_point cpp11::as_sexp(T) [with T = cpp11::function]’
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/named_arg.hpp:22:21: required from ‘cpp11::named_arg& cpp11::named_arg::operator=(T) [with T = cpp11::function]’
callback_registry.cpp:198:33: required from here
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:56:7: error: no type named ‘type’ in ‘struct std::enable_if’
56 | using enable_if_floating_point =
| ^~~~~~~~~~~~~~~~~~~~~~~~
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/named_arg.hpp: In instantiation of ‘cpp11::named_arg& cpp11::named_arg::operator=(T) [with T = cpp11::function]’:
callback_registry.cpp:198:33: required from here
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:217:25: note: candidate: ‘template cpp11::enable_if_bool cpp11::as_sexp(T)’
217 | enable_if_bool as_sexp(T from) {
| ^~~~~~~
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:217:25: note: template argument deduction/substitution failed:
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:222:29: note: candidate: ‘template cpp11::enable_if_c_string cpp11::as_sexp(T)’
222 | enable_if_c_string as_sexp(T from) {
| ^~~~~~~
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:222:29: note: template argument deduction/substitution failed:
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:227:31: note: candidate: ‘template cpp11::enable_if_std_string cpp11::as_sexp(const T&)’
227 | enable_if_std_string as_sexp(const T& from) {
| ^~~~~~~
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:227:31: note: template argument deduction/substitution failed:
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:233:29: note: candidate: ‘template cpp11::enable_if_integral cpp11::as_sexp(const Container&)’
233 | enable_if_integral as_sexp(const Container& from) {
| ^~~~~~~
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:233:29: note: template argument deduction/substitution failed:
/home/pacha/R/x86_64-pc-linux-gnu-library/4.4/cpp11/include/cpp11/as.hpp:231:31: error: no type named ‘value_type’ in ‘class cpp11::function’
231 | template

Подробнее здесь: https://stackoverflow.com/questions/791 ... -in-a-list