Homework-16

hw16/IndentStream.cpp

+#include <iostream>
+#include <streambuf>
+
+using namespace std;
+
+/*
+ostream &
+endl1(ostream &os) {
+  os << '~' << '\n';
+  os.flush();
+  return os;
+}
+
+template<typename charT, typename Traits>
+basic_ostream<charT, Traits> &
+endl2(basic_ostream<charT, Traits> &os) {
+  os << '!' << '\n';
+  os.flush();
+  return os;
+}
+*/
+
+class Indentbuf: public streambuf {
+public:
+  Indentbuf(streambuf* sbuf): m_sbuf(sbuf), m_indent(0), m_need(true) {}
+
+  void indent() { m_indent+=4; }
+  void unindent() { if(m_indent >= 4) m_indent-= 4; }
+
+protected:
+  virtual int_type overflow(int_type c) {
+    if (traits_type::eq_int_type(c, traits_type::eof())) {
+      return m_sbuf->sputc(c);
+    }
+
+    if (m_need) {
+      fill_n(ostreambuf_iterator<char>(m_sbuf), m_indent, ' ');
+      m_need = false;
+    }
+
+    if (traits_type::eq_int_type(m_sbuf->sputc(c), traits_type::eof())) {
+      return traits_type::eof();
+    }
+
+    if (traits_type::eq_int_type(c, traits_type::to_char_type('\n'))) {
+      m_need = true;
+    }
+
+    return traits_type::not_eof(c);
+}
+
+  streambuf* m_sbuf;
+  int m_indent;
+  bool m_need;
+};
+
+class IndentStream : public ostream {
+public:
+  IndentStream(ostream &os) : ostream(&ib), ib(os.rdbuf()){};
+
+  friend ostream& indent(ostream& stream);
+  friend ostream& unindent(ostream& stream);
+
+//private:
+  Indentbuf ib;
+};
+
+template<typename charT, typename Traits>
+basic_ostream<charT, Traits> &
+indent(basic_ostream<charT, Traits> & stream) {
+  IndentStream* pIndentStream = dynamic_cast<IndentStream*>(&stream);
+  if (pIndentStream != nullptr) {
+    pIndentStream->ib.indent();
+  }
+
+  return stream;
+}
+
+template<typename charT, typename Traits>
+basic_ostream<charT, Traits> &
+unindent(basic_ostream<charT, Traits> & stream) {
+  IndentStream* pIndentStream = dynamic_cast<IndentStream*>(&stream);
+  if (pIndentStream != nullptr) {
+    pIndentStream->ib.unindent();
+  }
+
+  return stream;
+}
+
+int main() {
+  IndentStream ins(cout);
+  ins << "Int" << endl;
+  ins << "fib(int n) {" << indent << endl;
+  ins << "if (n == 0)" << indent << endl;
+  ins << "return 0;" << unindent << endl;
+  ins << "if (n == 1)" << indent << endl;
+  ins << "return 1;" << unindent << endl;
+  ins << "return fib(n-2) + fib(n-1);" << unindent << endl;
+  ins << "}" << endl;
+
+  return 0;
+}
\ No newline at end of file

hw16/InvestigateLocale.cpp

+#include<iostream>
+#include<locale.h>
+#include<locale>
+#include<algorithm>
+
+using namespace std;
+
+int main() {
+  locale def;
+  cout << def.name() << endl;
+  locale current = cout.getloc();
+  cout << current.name() << endl;
+  char val = 'a';
+  cout << val << endl;
+  
+/*
+  $ locale > loc.info // the current locale is stored in loc.info
+  $ locale -a > locs.info // all the locales are stored in locs.info
+  
+  $ LC_ALL=en_US sort <<< $'a\nb\nA\nB'
+  a
+  A
+  b
+  B
+  $ LC_ALL=C sort <<< $'a\nb\nA\nB'
+  A
+  B
+  a
+  b
+  this is example on Unix-like system. I found this example online. Actually it does not work on my Mac and both show the same result, but I believe it works for other systems.
+*/
+
+  return 0;
+}
\ No newline at end of file

hw16/loc.info

+LANG="en_US.UTF-8"
+LC_COLLATE="en_US.UTF-8"
+LC_CTYPE="en_US.UTF-8"
+LC_MESSAGES="en_US.UTF-8"
+LC_MONETARY="en_US.UTF-8"
+LC_NUMERIC="en_US.UTF-8"
+LC_TIME="en_US.UTF-8"
+LC_ALL=

hw16/locs.info

+en_NZ
+nl_NL.UTF-8
+pt_BR.UTF-8
+fr_CH.ISO8859-15
+eu_ES.ISO8859-15
+en_US.US-ASCII
+af_ZA
+bg_BG
+cs_CZ.UTF-8
+fi_FI
+zh_CN.UTF-8
+eu_ES
+sk_SK.ISO8859-2
+nl_BE
+fr_BE
+sk_SK
+en_US.UTF-8
+en_NZ.ISO8859-1
+de_CH
+sk_SK.UTF-8
+de_DE.UTF-8
+am_ET.UTF-8
+zh_HK
+be_BY.UTF-8
+uk_UA
+pt_PT.ISO8859-1
+en_AU.US-ASCII
+kk_KZ.PT154
+en_US
+nl_BE.ISO8859-15
+de_AT.ISO8859-1
+hr_HR.ISO8859-2
+fr_FR.ISO8859-1
+af_ZA.UTF-8
+am_ET
+fi_FI.ISO8859-1
+ro_RO.UTF-8
+af_ZA.ISO8859-15
+en_NZ.UTF-8
+fi_FI.UTF-8
+hr_HR.UTF-8
+da_DK.UTF-8
+ca_ES.ISO8859-1
+en_AU.ISO8859-15
+ro_RO.ISO8859-2
+de_AT.UTF-8
+pt_PT.ISO8859-15
+sv_SE
+fr_CA.ISO8859-1
+fr_BE.ISO8859-1
+en_US.ISO8859-15
+it_CH.ISO8859-1
+en_NZ.ISO8859-15
+en_AU.UTF-8
+de_AT.ISO8859-15
+af_ZA.ISO8859-1
+hu_HU.UTF-8
+et_EE.UTF-8
+he_IL.UTF-8
+uk_UA.KOI8-U
+be_BY
+kk_KZ
+hu_HU.ISO8859-2
+it_CH
+pt_BR
+ko_KR
+it_IT
+fr_BE.UTF-8
+ru_RU.ISO8859-5
+zh_TW
+zh_CN.GB2312
+no_NO.ISO8859-15
+de_DE.ISO8859-15
+en_CA
+fr_CH.UTF-8
+sl_SI.UTF-8
+uk_UA.ISO8859-5
+pt_PT
+hr_HR
+cs_CZ
+fr_CH
+he_IL
+zh_CN.GBK
+zh_CN.GB18030
+fr_CA
+pl_PL.UTF-8
+ja_JP.SJIS
+sr_YU.ISO8859-5
+be_BY.CP1251
+sr_YU.ISO8859-2
+sv_SE.UTF-8
+sr_YU.UTF-8
+de_CH.UTF-8
+sl_SI
+pt_PT.UTF-8
+ro_RO
+en_NZ.US-ASCII
+ja_JP
+zh_CN
+fr_CH.ISO8859-1
+ko_KR.eucKR
+be_BY.ISO8859-5
+nl_NL.ISO8859-15
+en_GB.ISO8859-1
+en_CA.US-ASCII
+is_IS.ISO8859-1
+ru_RU.CP866
+nl_NL
+fr_CA.ISO8859-15
+sv_SE.ISO8859-15
+hy_AM
+en_CA.ISO8859-15
+en_US.ISO8859-1
+zh_TW.Big5
+ca_ES.UTF-8
+ru_RU.CP1251
+en_GB.UTF-8
+en_GB.US-ASCII
+ru_RU.UTF-8
+eu_ES.UTF-8
+es_ES.ISO8859-1
+hu_HU
+el_GR.ISO8859-7
+en_AU
+it_CH.UTF-8
+en_GB
+sl_SI.ISO8859-2
+ru_RU.KOI8-R
+nl_BE.UTF-8
+et_EE
+fr_FR.ISO8859-15
+cs_CZ.ISO8859-2
+lt_LT.UTF-8
+pl_PL.ISO8859-2
+fr_BE.ISO8859-15
+is_IS.UTF-8
+tr_TR.ISO8859-9
+da_DK.ISO8859-1
+lt_LT.ISO8859-4
+lt_LT.ISO8859-13
+zh_TW.UTF-8
+bg_BG.CP1251
+el_GR.UTF-8
+be_BY.CP1131
+da_DK.ISO8859-15
+is_IS.ISO8859-15
+no_NO.ISO8859-1
+nl_NL.ISO8859-1
+nl_BE.ISO8859-1
+sv_SE.ISO8859-1
+pt_BR.ISO8859-1
+zh_CN.eucCN
+it_IT.UTF-8
+en_CA.UTF-8
+uk_UA.UTF-8
+de_CH.ISO8859-15
+de_DE.ISO8859-1
+ca_ES
+sr_YU
+hy_AM.ARMSCII-8
+ru_RU
+zh_HK.UTF-8
+eu_ES.ISO8859-1
+is_IS
+bg_BG.UTF-8
+ja_JP.UTF-8
+it_CH.ISO8859-15
+fr_FR.UTF-8
+ko_KR.UTF-8
+et_EE.ISO8859-15
+kk_KZ.UTF-8
+ca_ES.ISO8859-15
+en_IE.UTF-8
+es_ES
+de_CH.ISO8859-1
+en_CA.ISO8859-1
+es_ES.ISO8859-15
+en_AU.ISO8859-1
+el_GR
+da_DK
+no_NO
+it_IT.ISO8859-1
+en_IE
+zh_HK.Big5HKSCS
+hi_IN.ISCII-DEV
+ja_JP.eucJP
+it_IT.ISO8859-15
+pl_PL
+ko_KR.CP949
+fr_CA.UTF-8
+fi_FI.ISO8859-15
+en_GB.ISO8859-15
+fr_FR
+hy_AM.UTF-8
+no_NO.UTF-8
+es_ES.UTF-8
+de_AT
+tr_TR.UTF-8
+de_DE
+lt_LT
+tr_TR
+C
+POSIX