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  1.     #ifndef pretty_print_0x57547_sa4884X_0_1_h_guard_
  2.     #define pretty_print_0x57547_sa4884X_0_1_h_guard_
  3.  
  4.     #include <string>
  5.     #include <iostream>
  6.     #include <type_traits>
  7.     #include <iterator>
  8.     #include <utility>
  9.  
  10.     #define PRETTY_DEFAULT_DECORATION(TYPE, PREFIX, DELIM, POSTFIX, ...) \
  11.         namespace pretty { template< __VA_ARGS__ >\
  12.         struct defaulted< TYPE > {\
  13.         static decor< TYPE > decoration(){\
  14.           return { PREFIX, DELIM, POSTFIX };\
  15.         } /*decoration*/ }; /*defaulted*/} /*pretty*/
  16.  
  17.     #define PRETTY_DEFAULT_WDECORATION(TYPE, PREFIX, DELIM, POSTFIX, ...) \
  18.         namespace pretty { template< __VA_ARGS__ >\
  19.         struct defaulted< TYPE, wchar_t, std::char_traits<wchar_t> > {\
  20.         static decor< TYPE, wchar_t, std::char_traits<wchar_t> > decoration(){\
  21.           return { PREFIX, DELIM, POSTFIX };\
  22.         } /*decoration*/ }; /*defaulted*/} /*pretty*/
  23.  
  24.     namespace pretty
  25.     {
  26.  
  27.       namespace detail
  28.       {
  29.         // drag in begin and end overloads
  30.         using std::begin;
  31.         using std::end;
  32.         // helper template
  33.         template <int I> using _ol = std::integral_constant<int, I>*;
  34.         // SFINAE check whether T is a range with begin/end
  35.         template<class T>
  36.         class is_range
  37.         {
  38.           // helper function declarations using expression sfinae
  39.           template <class U, _ol<0> = nullptr>
  40.           static std::false_type b(...);
  41.           template <class U, _ol<1> = nullptr>
  42.           static auto b(U &v) -> decltype(begin(v), std::true_type());
  43.           template <class U, _ol<0> = nullptr>
  44.           static std::false_type e(...);
  45.           template <class U, _ol<1> = nullptr>
  46.           static auto e(U &v) -> decltype(end(v), std::true_type());
  47.           // return types
  48.           using b_return = decltype(b<T>(std::declval<T&>()));
  49.           using e_return = decltype(e<T>(std::declval<T&>()));
  50.         public:
  51.           static const bool value = b_return::value && e_return::value;
  52.         };
  53.       }
  54.  
  55.       // holder class for data
  56.       template<class T, class CharT = char,
  57.       class TraitT = std::char_traits < CharT >>
  58.       struct decor
  59.       {
  60.         static const int xindex;
  61.         std::basic_string<CharT, TraitT> prefix, delimiter, postfix;
  62.         decor(std::basic_string<CharT, TraitT> const & pre = "",
  63.           std::basic_string<CharT, TraitT> const & delim = "",
  64.           std::basic_string<CharT, TraitT> const & post = "")
  65.           : prefix(pre), delimiter(delim), postfix(post) {}
  66.       };
  67.  
  68.       template<class T, class charT, class traits>
  69.       int const decor<T, charT, traits>::xindex = std::ios_base::xalloc();
  70.  
  71.       namespace detail
  72.       {
  73.  
  74.         template<class T, class CharT, class TraitT>
  75.         void manage_decor(std::ios_base::event evt, std::ios_base &s, int const idx)
  76.         {
  77.           using deco_type = decor<T, CharT, TraitT>;
  78.           if (evt == std::ios_base::erase_event)
  79.           { // erase deco
  80.             void const * const p = s.pword(idx);
  81.             if (p)
  82.             {
  83.               delete static_cast<deco_type const * const>(p);
  84.               s.pword(idx) = nullptr;
  85.             }
  86.           }
  87.           else if (evt == std::ios_base::copyfmt_event)
  88.           { // copy deco
  89.             void const * const p = s.pword(idx);
  90.             if (p)
  91.             {
  92.               auto np = new deco_type{ *static_cast<deco_type const * const>(p) };
  93.               s.pword(idx) = static_cast<void*>(np);
  94.             }
  95.           }
  96.         }
  97.  
  98.         template<class T>
  99.         struct clearer {};
  100.  
  101.         template<class T, class CharT, class TraitT>
  102.         std::basic_ostream<CharT, TraitT>& operator<< (
  103.           std::basic_ostream<CharT, TraitT> &s, clearer<T> const &)
  104.         {
  105.           using deco_type = decor<T, CharT, TraitT>;
  106.           void const * const p = s.pword(deco_type::xindex);
  107.           if (p)
  108.           { // delete if set
  109.             delete static_cast<deco_type const *>(p);
  110.             s.pword(deco_type::xindex) = nullptr;
  111.           }
  112.           return s;
  113.         }
  114.  
  115.         template<class CharT, class TraitT = std::char_traits<CharT>>
  116.         struct default_data
  117.         {
  118.           static inline std::basic_string<CharT, TraitT> prefix() { return{ "" }; }
  119.           static inline std::basic_string<CharT, TraitT> delimiter() { return{ ", " }; }
  120.           static inline std::basic_string<CharT, TraitT> postfix() { return{ "" }; }
  121.         };
  122.  
  123.         template<>
  124.         struct default_data<wchar_t, std::char_traits<wchar_t>>
  125.         {
  126.           using CT = std::char_traits<wchar_t>;
  127.           static inline std::basic_string<wchar_t, CT> prefix() { return{ L"" }; }
  128.           static inline std::basic_string<wchar_t, CT> delimiter() { return{ L", " }; }
  129.           static inline std::basic_string<wchar_t, CT> postfix() { return{ L"" }; }
  130.         };
  131.  
  132.       }
  133.  
  134.       // Clear decoration for T
  135.       template<class T>
  136.       detail::clearer<T> clear() { return{}; }
  137.       template<class T, class CharT, class TraitT>
  138.       void clear(std::basic_ostream<CharT, TraitT> &s) { s << detail::clearer<T>{}; }
  139.  
  140.       // impose decoration on ostream
  141.       template<class T, class CharT, class TraitT>
  142.       std::basic_ostream<CharT, TraitT>& operator<<(
  143.         std::basic_ostream<CharT, TraitT> &s, decor<T, CharT, TraitT> && h)
  144.       {
  145.         using deco_type = decor<T, CharT, TraitT>;
  146.         void const * const p = s.pword(deco_type::xindex);
  147.         // delete if already set
  148.         if (p) delete static_cast<decor<T, CharT, TraitT> const *>(p);
  149.         s.pword(deco_type::xindex) = static_cast<void *>(new deco_type{ std::move(h) });
  150.         // check whether we alread have a callback registered
  151.         if (s.iword(deco_type::xindex) == 0)
  152.         { // if this is not the case register callback and set iword
  153.           s.register_callback(detail::manage_decor<T, CharT, TraitT>, deco_type::xindex);
  154.           s.iword(deco_type::xindex) = 1;
  155.         }
  156.         return s;
  157.       }
  158.  
  159.       template<class T, class CharT = char, class TraitT = std::char_traits<CharT>>
  160.       struct defaulted
  161.       {
  162.         static inline decor<T, CharT, TraitT> decoration()
  163.         {
  164.           return{ detail::default_data<CharT, TraitT>::prefix(),
  165.             detail::default_data<CharT, TraitT>::delimiter(),
  166.             detail::default_data<CharT, TraitT>::postfix() };
  167.         }
  168.       };
  169.  
  170.       template<class T, class CharT = char, class TraitT = std::char_traits<CharT>>
  171.       decor<T, CharT, TraitT> decoration(std::basic_string<CharT, TraitT> const & prefix,
  172.         std::basic_string<CharT, TraitT> const & delimiter,
  173.         std::basic_string<CharT, TraitT> const & postfix)
  174.       {
  175.         return{ prefix, delimiter, postfix };
  176.       }
  177.  
  178.       template<class T, class CharT = char,
  179.       class TraitT = std::char_traits < CharT >>
  180.         decor<T, CharT, TraitT> decoration(std::basic_string<CharT, TraitT> const & delimiter)
  181.       {
  182.         using str_type = std::basic_string<CharT, TraitT>;
  183.         return{ defaulted<T, CharT, TraitT>::decoration().prefix,
  184.           delimiter, defaulted<T, CharT, TraitT>::decoration().postfix };
  185.       }
  186.  
  187.       template<class T, class CharT = char,
  188.       class TraitT = std::char_traits < CharT >>
  189.         decor<T, CharT, TraitT> decoration(CharT const * const prefix,
  190.           CharT const * const delimiter, CharT const * const postfix)
  191.       {
  192.         using str_type = std::basic_string<CharT, TraitT>;
  193.         return{ str_type{ prefix }, str_type{ delimiter }, str_type{ postfix } };
  194.       }
  195.  
  196.       template<class T, class CharT = char,
  197.       class TraitT = std::char_traits < CharT >>
  198.         decor<T, CharT, TraitT> decoration(CharT const * const delimiter)
  199.       {
  200.         using str_type = std::basic_string<CharT, TraitT>;
  201.         return{ defaulted<T, CharT, TraitT>::decoration().prefix,
  202.           str_type{ delimiter }, defaulted<T, CharT, TraitT>::decoration().postfix };
  203.       }
  204.  
  205.       template<typename T, std::size_t N, std::size_t L>
  206.       struct tuple
  207.       {
  208.         template<class CharT, class TraitT>
  209.         static void print(std::basic_ostream<CharT, TraitT>& s, T const & value,
  210.           std::basic_string<CharT, TraitT> const &delimiter)
  211.         {
  212.           s << std::get<N>(value) << delimiter;
  213.           tuple<T, N + 1, L>::print(s, value, delimiter);
  214.         }
  215.       };
  216.  
  217.       template<typename T, std::size_t N>
  218.       struct tuple<T, N, N>
  219.       {
  220.         template<class CharT, class TraitT>
  221.         static void print(std::basic_ostream<CharT, TraitT>& s, T const & value,
  222.           std::basic_string<CharT, TraitT> const &) {
  223.           s << std::get<N>(value);
  224.         }
  225.       };
  226.  
  227.     }
  228.  
  229.     template<class CharT, class TraitT>
  230.     std::basic_ostream<CharT, TraitT> & operator<< (
  231.       std::basic_ostream<CharT, TraitT> &s, std::tuple<> const & v)
  232.     {
  233.       using deco_type = pretty::decor<std::tuple<void*>, CharT, TraitT>;
  234.       using defaulted_type = pretty::defaulted<std::tuple<void*>, CharT, TraitT>;
  235.       void const * const p = s.pword(deco_type::xindex);
  236.       auto const d = static_cast<deco_type const * const>(p);
  237.       s << (d ? d->prefix : defaulted_type::decoration().prefix);
  238.       s << (d ? d->postfix : defaulted_type::decoration().postfix);
  239.       return s;
  240.     }
  241.  
  242.     template<class CharT, class TraitT, class ... T>
  243.     std::basic_ostream<CharT, TraitT> & operator<< (
  244.       std::basic_ostream<CharT, TraitT> &s, std::tuple<T...> const & v)
  245.     {
  246.       using deco_type = pretty::decor<std::tuple<void*>, CharT, TraitT>;
  247.       using defaulted_type = pretty::defaulted<std::tuple<void*>, CharT, TraitT>;
  248.       using pretty_tuple = pretty::tuple<std::tuple<T...>, 0U, sizeof...(T)-1U>;
  249.       void const * const p = s.pword(deco_type::xindex);
  250.       auto const d = static_cast<deco_type const * const>(p);
  251.       s << (d ? d->prefix : defaulted_type::decoration().prefix);
  252.       pretty_tuple::print(s, v, d ? d->delimiter : defaulted_type::decoration().delimiter);
  253.       s << (d ? d->postfix : defaulted_type::decoration().postfix);
  254.       return s;
  255.     }
  256.  
  257.     template<class T, class U, class CharT, class TraitT>
  258.     std::basic_ostream<CharT, TraitT> & operator<< (
  259.       std::basic_ostream<CharT, TraitT> &s, std::pair<T, U> const & v)
  260.     {
  261.       using deco_type = pretty::decor<std::pair<T, U>, CharT, TraitT>;
  262.       using defaulted_type = pretty::defaulted<std::pair<T, U>, CharT, TraitT>;
  263.       void const * const p = s.pword(deco_type::xindex);
  264.       auto const d = static_cast<deco_type const * const>(p);
  265.       s << (d ? d->prefix : defaulted_type::decoration().prefix);
  266.       s << v.first;
  267.       s << (d ? d->delimiter : defaulted_type::decoration().delimiter);
  268.       s << v.second;
  269.       s << (d ? d->postfix : defaulted_type::decoration().postfix);
  270.       return s;
  271.     }
  272.  
  273.  
  274.     template<class T, class CharT = char,
  275.     class TraitT = std::char_traits < CharT >>
  276.       typename std::enable_if < pretty::detail::is_range<T>::value,
  277.       std::basic_ostream < CharT, TraitT >> ::type & operator<< (
  278.         std::basic_ostream<CharT, TraitT> &s, T const & v)
  279.     {
  280.       bool first(true);
  281.       using deco_type = pretty::decor<T, CharT, TraitT>;
  282.       using default_type = pretty::defaulted<T, CharT, TraitT>;
  283.       void const * const p = s.pword(deco_type::xindex);
  284.       auto d = static_cast<pretty::decor<T, CharT, TraitT> const * const>(p);
  285.       s << (d ? d->prefix : default_type::decoration().prefix);
  286.       for (auto const & e : v)
  287.       { // v is range thus range based for works
  288.         if (!first) s << (d ? d->delimiter : default_type::decoration().delimiter);
  289.         s << e;
  290.         first = false;
  291.       }
  292.       s << (d ? d->postfix : default_type::decoration().postfix);
  293.       return s;
  294.     }
  295.  
  296.     #endif // pretty_print_0x57547_sa4884X_0_1_h_guard_
  297.  
  298.  
  299. #include <vector>
  300. #include <map>
  301. #include <set>
  302. #include <sstream>
  303. #include <list>
  304. #include <exception>
  305. #include <utility>
  306.  
  307. PRETTY_DEFAULT_DECORATION(T[N], "[", ";", "]", class T, std::size_t N)
  308. #define COMMA ,
  309. PRETTY_DEFAULT_DECORATION(std::pair<T COMMA U>, "(", ", ", ")", class T, class U)
  310.  
  311. int main(int argc, char ** argv)
  312. {
  313.  
  314. #ifndef _DROP_EXCEPTIONS
  315.   try
  316.   {
  317. #endif
  318.  
  319.     float e[5] = { 1.1f, 2.2f, 3.3f, 4.4f, 5.5f };
  320.  
  321.     std::vector<std::vector<int>> m{ { 1,2,3 },{ 4,5,6 },{ 7,8,9 } };
  322.     std::cout << pretty::decoration<std::vector<std::vector<int>>>("\n");
  323.     std::cout << m;
  324.     std::stringstream u, v;
  325.     // apply different decoration to u and v
  326.     u << pretty::decoration<float[5]>("{", "; ", "}");
  327.     v << pretty::decoration<float[5]>("[", ", ", "]");
  328.     std::cout << e << '\n'; // using specialized decoration above
  329.     u << e << '\n';
  330.     v << e << '\n';
  331.     std::cout << u.str() << v.str();
  332.  
  333.     std::set<int> ms{ 1, 5, 3, 2, 9, 6, 7 };
  334.     std::cout << ms << '\n';
  335.  
  336.     std::map<int, int> mm{ std::make_pair<const int, int>(1,1), 
  337.       std::make_pair<const int, int>(2,4), 
  338.       std::make_pair<const int, int>(3,7) };
  339.     std::cout << mm << '\n';
  340.  
  341.     std::list<int> ml{ 12, 12, 15, 8, 2, 1, 4 };
  342.     std::cout << ml << '\n';
  343.  
  344.     std::vector<int> mv{ 155, 32, 26, 0 };
  345.     std::cout << mv << '\n';
  346.  
  347.     std::vector<int> a{ 2, 3, 4, 1 }, b{ 4, 6, 1, 2 };
  348.     std::vector<std::vector<int>> c{ a, b, b, a };
  349.     std::vector<double> d{ 4.,5.,8.,124.4 };
  350.  
  351.     std::cout << pretty::decoration<std::vector<int>>("[[  ", " :: ", "  ]]");
  352.     std::cout << a << '\n';
  353.     std::cout << b << '\n';
  354.     std::cout << pretty::clear<std::vector<int>>();
  355.     std::cout << c << '\n';
  356.     std::cout << d << '\n';
  357.  
  358.  
  359. #ifndef _DROP_EXCEPTIONS
  360.   }
  361.   catch (std::exception & e)
  362.   {
  363.     std::cout << e.what();
  364.   }
  365. #endif
  366.  
  367.   return 0;
  368. }
  369.  
Success #stdin #stdout 0s 3456KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
1, 2, 3
4, 5, 6
7, 8, 9[1.1;2.2;3.3;4.4;5.5]
{1.1; 2.2; 3.3; 4.4; 5.5}
[1.1, 2.2, 3.3, 4.4, 5.5]
1, 2, 3, 5, 6, 7, 9
(1, 1), (2, 4), (3, 7)
12, 12, 15, 8, 2, 1, 4
155, 32, 26, 0
[[  2 :: 3 :: 4 :: 1  ]]
[[  4 :: 6 :: 1 :: 2  ]]
2, 3, 4, 1
4, 6, 1, 2
4, 6, 1, 2
2, 3, 4, 1
4, 5, 8, 124.4
https://ideone.com/KKUebZ
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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