问题描述
假设我在 R 中有以下两个类:
setClass("Person",representation(name = "character",age = "numeric"))
setClass("Employee",representation(boss = "Person"),contains = "Person")
我可以轻松地检查基 R 中的继承:
employee <- new("Employee",name = "Jack",age = 25)
inherits(employee,"Employee")
#> [1] TRUE
inherits(employee,"Person")
#> [1] TRUE
我无法在 Rcpp
中实现相同的效果:
Rcpp::cppFunction('
void check_class(Rcpp::S4 x) {
Rcout << "Class: " << as<std::string>(x.attr("class")) << std::endl;
Rcout << "x.inherits(\\"Employee\\") : " << x.inherits("Employee") << std::endl;
Rcout << "x.inherits(\\"Person\\") : " << x.inherits("Person") << std::endl;
Rcout << "Rf_inherits(x,\\"Employee\\") : " << Rf_inherits(x,"Employee") << std::endl;
Rcout << "Rf_inherits(x,\\"Person\\") : " << Rf_inherits(x,"Person") << std::endl;
Rcout << "R_extends : " << R_extends(x,Rf_mkString("Person"),R_GlobalEnv) << std::endl;
}')
check_class(employee)
#> Class: Employee
#> x.inherits("Employee") : 1
#> x.inherits("Person") : 0
#> Rf_inherits(x,"Employee") : 1
#> Rf_inherits(x,"Person") : 0
#> R_extends :
#> Error in extends(new("Employee",boss = new("Person",name = character(0),: 'class1' must be the name of a class or a class deFinition
我希望 x.inherits("Person")
也是 true
。
如何检查对象是否继承自 Rcpp 中的父类?
解决方法
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