cat.h

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#ifndef GUL14_CAT_H_
#define GUL14_CAT_H_
 
#include <string>
#include <type_traits>
#include "gul14/internal.h"
#include "gul14/string_view.h"
 
namespace gul14 {
 
class ConvertingStringView
{
public:
    ConvertingStringView(const std::string &str) : sv_(str) {} 
    ConvertingStringView(string_view sv) : sv_(sv) {} 
    ConvertingStringView(const char *str) : sv_(str) {} 
 
    ConvertingStringView(char c) : str_(1, c), sv_(str_) {} 
    ConvertingStringView(int a) : str_(std::to_string(a)), sv_(str_) {} 
    ConvertingStringView(unsigned int a) : str_(std::to_string(a)), sv_(str_) {} 
    ConvertingStringView(long a) : str_(std::to_string(a)), sv_(str_) {} 
    ConvertingStringView(unsigned long a) : str_(std::to_string(a)), sv_(str_) {} 
    ConvertingStringView(long long a) : str_(std::to_string(a)), sv_(str_) {} 
    ConvertingStringView(unsigned long long a) : str_(std::to_string(a)), sv_(str_) {} 
    ConvertingStringView(float a) : str_(std::to_string(a)), sv_(str_) {} 
    ConvertingStringView(double a) : str_(std::to_string(a)), sv_(str_) {} 
 
    const char *data() const noexcept { return sv_.data(); }
 
    std::size_t length() const noexcept { return sv_.length(); }
 
    std::size_t size() const noexcept { return sv_.size(); }
 
    explicit operator std::string() const { return std::string(sv_); };
 
private:
    std::string str_;
    string_view sv_;
};
 
inline std::string cat() { return std::string(); }
 
inline std::string cat(const ConvertingStringView& s) { return std::string(s); }
 
GUL_EXPORT
std::string cat(const ConvertingStringView& s1, const ConvertingStringView& s2);
 
GUL_EXPORT
std::string cat(const ConvertingStringView& s1, const ConvertingStringView& s2,
                const ConvertingStringView& s3);
 
GUL_EXPORT
std::string cat(std::initializer_list<ConvertingStringView> pieces);
 
template <typename... Args, typename = std::enable_if_t<(sizeof...(Args) > 3)>>
inline std::string cat(const Args&... args)
{
    return cat({ args... }); // NOLINT(cppcoreguidelines-pro-bounds-array-to-pointer-decay): Impossible to remove that warning
}
 
} // namespace gul14
 
#endif