cpp11/inst/include/cpp11/as.hpp at master · tmastny/cpp11 · GitHub

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#pragma once

#include <cmath> // for modf

#include <initializer_list> // for initializer_list

#include <string> // for string, basic_string

#include <type_traits> // for decay, enable_if, is_same, is_convertible

#include "cpp11/R.hpp" // for SEXP, SEXPREC, Rf_xlength, R_xlen_t

#include "cpp11/protect.hpp" // for stop, protect, safe, protect::function

namespace cpp11 {

template <typename T>

using is_constructible_from_sexp =

typename std::enable_if<(std::is_class<typename std::decay<T>::type>::value ||

std::is_same<T, SEXP>::value) &&

std::is_constructible<T, SEXP>::value,

typename std::decay<T>::type>::type;

template <typename T>

is_constructible_from_sexp<T> as_cpp(SEXP from) {

return T(from);

}

template <typename T>

using is_integral = typename std::enable_if<

std::is_integral<T>::value &&

!std::is_same<typename std::decay<T>::type, bool>::value &&

!std::is_same<typename std::decay<T>::type, char>::value,

typename std::decay<T>::type>::type;

template <typename T>

using is_integral_value = typename std::enable_if<

std::is_integral<T>::value &&

!std::is_same<typename std::decay<T>::type, bool>::value &&

!std::is_same<typename std::decay<T>::type, char>::value,

typename std::decay<T>::type>::value;

// https://stackoverflow.com/a/1521682/2055486

inline bool is_convertable_without_loss_to_integer(double value) {

double int_part;

return std::modf(value, &int_part) == 0.0;

}

template <typename T>

is_integral<T> as_cpp(SEXP from) {

if (Rf_isInteger(from)) {

if (Rf_xlength(from) == 1) {

return INTEGER_ELT(from, 0);

}

} else if (Rf_isReal(from)) {

if (Rf_xlength(from) == 1) {

if (ISNA(REAL_ELT(from, 0))) {

return NA_INTEGER;

}

double value = REAL_ELT(from, 0);

if (is_convertable_without_loss_to_integer(value)) {

return value;

}

} else if (Rf_isLogical(from)) {

if (Rf_xlength(from) == 1) {

if (LOGICAL_ELT(from, 0) == NA_LOGICAL) {

return NA_INTEGER;

}

stop("Expected single integer value");

return T();

}

template <typename T>

using is_logical =

typename std::enable_if<std::is_same<typename std::decay<T>::type, bool>::value,

typename std::decay<T>::type>::type;

template <typename T>

is_logical<T> as_cpp(SEXP from) {

if (Rf_isLogical(from)) {

if (Rf_xlength(from) == 1) {

return LOGICAL_ELT(from, 0) == 1;

}

stop("Expected single logical value");

return T();

}

template <typename T>

using is_floating_point_value =

typename std::enable_if<std::is_floating_point<T>::value, T>::type;

template <typename T>

is_floating_point_value<T> as_cpp(SEXP from) {

if (Rf_isReal(from)) {

if (Rf_xlength(from) == 1) {

return REAL_ELT(from, 0);

}

// All 32 bit integers can be coerced to doubles, so we just convert them.

if (Rf_isInteger(from)) {

if (Rf_xlength(from) == 1) {

if (INTEGER_ELT(from, 0) == NA_INTEGER) {

return NA_REAL;

}

return INTEGER_ELT(from, 0);

}

// Also allow NA values

if (Rf_isLogical(from)) {

if (Rf_xlength(from) == 1) {

if (LOGICAL_ELT(from, 0) == NA_LOGICAL) {

return NA_REAL;

}

stop("Expected single double value");

return T();

}

template <typename T>

using is_char =

typename std::enable_if<std::is_same<typename std::decay<T>::type, char>::value,

typename std::decay<T>::type>::type;

template <typename T>

is_char<T> as_cpp(SEXP from) {

if (Rf_isString(from)) {

if (Rf_xlength(from) == 1) {

const char* c_p = nullptr;

unwind_protect([&] { c_p = Rf_translateCharUTF8(STRING_ELT(from, 0)); });

return c_p[0];

}

stop("Expected string vector of length 1");

return T();

}

template <typename T>

using is_constructible_from_const_char = typename std::enable_if<

std::is_constructible<typename std::decay<T>::type, const char*>::value &&

!std::is_constructible<T, SEXP>::value,

typename std::decay<T>::type>::type;

template <typename T>

is_constructible_from_const_char<T> as_cpp(SEXP from) {

if (Rf_isString(from)) {

if (Rf_xlength(from) == 1) {

const char* c_p = nullptr;

// TODO: use vmaxget / vmaxset here?

unwind_protect([&] { c_p = Rf_translateCharUTF8(STRING_ELT(from, 0)); });

return {c_p};

}

stop("Expected string vector of length 1");

return T(nullptr);

}

template <typename T, is_integral<T>* = nullptr>

inline SEXP as_sexp(T from) {

return safe[Rf_ScalarInteger](from);

}

template <typename T, is_floating_point_value<T>* = nullptr>

inline SEXP as_sexp(T from) {

return safe[Rf_ScalarReal](from);

}

inline SEXP as_sexp(const std::string& from) {

SEXP res;

unwind_protect([&] { res = Rf_ScalarString(Rf_mkCharCE(from.c_str(), CE_UTF8)); });

return res;

}

template <typename T>

using is_bool =

typename std::enable_if<std::is_same<typename std::decay<T>::type, bool>::value,

typename std::decay<T>::type>::type;

template <typename T, is_bool<T> = false>

inline SEXP as_sexp(T from) {

return safe[Rf_ScalarLogical](from);

}

template <typename C, typename T = typename C::value_type,

typename std::enable_if<!std::is_convertible<C, SEXP>::value,

is_integral<T>>::type* = nullptr>

inline SEXP as_sexp(C from) {

R_xlen_t size = from.size();

SEXP data = safe[Rf_allocVector](INTSXP, size);

auto it = from.begin();

int* data_p = INTEGER(data);

for (R_xlen_t i = 0; i < size; ++i, ++it) {

data_p[i] = *it;

}

return data;

}

inline SEXP as_sexp(std::initializer_list<int> from) {

return as_sexp<std::initializer_list<int>>(from);

}

template <typename C, typename T = typename C::value_type,

is_floating_point_value<T>* = nullptr>

inline SEXP as_sexp(C from) {

R_xlen_t size = from.size();

SEXP data = safe[Rf_allocVector](REALSXP, size);

auto it = from.begin();

double* data_p = REAL(data);

for (R_xlen_t i = 0; i < size; ++i, ++it) {

data_p[i] = *it;

}

return data;

}

inline SEXP as_sexp(std::initializer_list<double> from) {

return as_sexp<std::initializer_list<double>>(from);

}

template <typename C, typename T = typename C::value_type, is_bool<T>* = nullptr>

inline SEXP as_sexp(C from) {

R_xlen_t size = from.size();

SEXP data = safe[Rf_allocVector](LGLSXP, size);

auto it = from.begin();

int* data_p = LOGICAL(data);

for (R_xlen_t i = 0; i < size; ++i, ++it) {

data_p[i] = *it;

}

return data;

}

inline SEXP as_sexp(std::initializer_list<bool> from) {

return as_sexp<std::initializer_list<bool>>(from);

}

template <typename T>

using is_convertible_to_std_string = typename std::enable_if<

std::is_convertible<typename std::decay<T>::type, std::string>::value &&

!std::is_convertible<typename std::decay<T>::type, const char*>::value,

typename std::decay<T>::type>::type;

template <typename C, typename T = typename C::value_type,

is_convertible_to_std_string<T>* = nullptr>

inline SEXP as_sexp(C from) {

R_xlen_t size = from.size();

SEXP data;

try {

data = PROTECT(safe[Rf_allocVector](STRSXP, size));

auto it = from.begin();

for (R_xlen_t i = 0; i < size; ++i, ++it) {

SET_STRING_ELT(data, i,

safe[Rf_mkCharCE](static_cast<std::string>(*it).c_str(), CE_UTF8));

}

} catch (const unwind_exception& e) {

UNPROTECT(1);

throw e;

}

UNPROTECT(1);

return data;

}

template <typename T>

using is_convertible_to_const_char = typename std::enable_if<

std::is_convertible<typename std::decay<T>::type, const char*>::value &&

!std::is_convertible<typename std::decay<T>::type, SEXP>::value,

typename std::decay<T>::type>::type;

template <typename C, typename T = typename C::value_type,

is_convertible_to_const_char<T>* = nullptr>

inline SEXP as_sexp(C from) {

R_xlen_t size = from.size();

SEXP data;

try {

data = PROTECT(safe[Rf_allocVector](STRSXP, size));

auto it = from.begin();

for (R_xlen_t i = 0; i < size; ++i, ++it) {

SET_STRING_ELT(data, i, safe[Rf_mkCharCE](static_cast<const char*>(*it), CE_UTF8));

}

} catch (const unwind_exception& e) {

UNPROTECT(1);

throw e;

}

UNPROTECT(1);

return data;

}

inline SEXP as_sexp(std::initializer_list<const char*> from) {

return as_sexp<std::initializer_list<const char*>>(from);

}

inline SEXP as_sexp(SEXP from) { return from; }

} // namespace cpp11

cpp11/inst/include/cpp11/as.hpp at master · tmastny/cpp11 · GitHub

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