59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
/* @file concat.hpp */
|
|
|
|
#pragma once
|
|
|
|
#include "ppdetail_atomic.hpp"
|
|
#include <ostream>
|
|
#include <utility> // for std::move()
|
|
|
|
namespace xo {
|
|
template <typename T1, typename T2>
|
|
struct concat_impl {
|
|
public:
|
|
concat_impl(T1 && x1, T2 && x2)
|
|
: x1_{std::forward<T1>(x1)}, x2_{std::forward<T2>(x2)} {}
|
|
|
|
T1 const & x1() const { return x1_; }
|
|
T2 const & x2() const { return x2_; }
|
|
|
|
private:
|
|
T1 x1_;
|
|
T2 x2_;
|
|
}; /*concat_impl*/
|
|
|
|
template <typename T1>
|
|
T1 concat(T1 && x1) {
|
|
return x1;
|
|
} /*concat*/
|
|
|
|
template <typename T1, typename T2>
|
|
concat_impl<T1,T2> concat(T1 && x1, T2 && x2) {
|
|
return concat_impl<T1,T2>(std::move(x1), std::move(x2));
|
|
} /*concat*/
|
|
|
|
template <typename T1, typename T2>
|
|
inline std::ostream &
|
|
operator<<(std::ostream & os, concat_impl<T1, T2> const & x) {
|
|
os << x.x1() << x.x2();
|
|
return os;
|
|
} /*operator<<*/
|
|
|
|
#ifndef ppdetail_atomic
|
|
namespace print {
|
|
/* concat expected to be used on short string-like things.
|
|
* i.e. don't want structure visible to pretty-printer.
|
|
* could be using it like concat("boeing", 777)
|
|
*/
|
|
template <typename T1, typename T2>
|
|
struct ppdetail<concat_impl<T1,T2>> {
|
|
using target_type = concat_impl<T1,T2>;
|
|
|
|
static bool print_pretty(const ppindentinfo & ppii, const target_type & x) {
|
|
return ppdetail_atomic<target_type>::print_pretty(ppii, x);
|
|
}
|
|
};
|
|
}
|
|
#endif
|
|
} /*namespace xo*/
|
|
|
|
/* end concat.hpp */
|