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/* This testcase checks whether SWIG correctly uses the new result_of class
and its templating capabilities introduced in C++11. */
%module cpp11_result_of
// std::result_of is deprecated in C++17
// Replace std implementation with a simple implementation in order to continue testing with C++17 compilers and later
%inline %{
typedef double(*fn_ptr)(double);
%}
%{
#if __cplusplus >= 201703L
namespace std {
// Forward declaration of result_of
template<typename Func> struct result_of;
// Add in the required partial specialization of result_of
template<> struct result_of< fn_ptr(double) > {
typedef double type;
};
}
#else
#include <functional>
#endif
%}
namespace std {
// Forward declaration of result_of
template<typename Func> struct result_of;
// Add in the required partial specialization of result_of
template<> struct result_of< fn_ptr(double) > {
typedef double type;
};
}
%template() std::result_of< fn_ptr(double) >;
%inline %{
double square(double x) {
return (x * x);
}
template<class Fun, class Arg>
typename std::result_of<Fun(Arg)>::type test_result_impl(Fun fun, Arg arg) {
return fun(arg);
}
std::result_of< fn_ptr(double) >::type test_result_alternative1(double(*fun)(double), double arg) {
return fun(arg);
}
%}
%inline %{
#include <iostream>
void cpp_testing() {
std::cout << "result: " << test_result_impl(square, 3.0) << std::endl;
std::cout << "result: " << test_result_impl<double(*)(double), double>(square, 4.0) << std::endl;
std::cout << "result: " << test_result_impl< fn_ptr, double >(square, 5.0) << std::endl;
std::cout << "result: " << test_result_alternative1(square, 6.0) << std::endl;
}
%}
%template(test_result) test_result_impl< fn_ptr, double>;
%constant double (*SQUARE)(double) = square;
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