addscienum

15/03/b2.cpp

@@ -0,0 +1,11 @@
+#include <cstdio>
+#include <string>
+
+using namespace std;
+
+int main() {
+    string s1 = "hello";
+    string s2 = "world";
+    string s3 = s1 + s2;
+    printf("%s\n", s3.c_str());
+}

15/04/a.cpp

@@ -1,10 +1,13 @@
 #include <string>
 #include <iostream>
+#include <sstream>
+#include <iomanip>
 
 using namespace std;
 
 int main() {
-    int n = 42;
-    auto s = to_string(n) + " yuan"s;
-    cout << s << endl;
+    //string s = (stringstream() << setprecision(100) << 3.1415f).str();
+    //stringstream("3.1415926535") >> f;
+    int n = 10011;
+    cout << setprecision(4) << (n * 0.01) << endl;
 }

15/06/f3.cpp

@@ -20,9 +20,10 @@ vector<string> split(string s) {
 }
 
 int main() {
-    string s = "hello world pyb teacher good job"s;
+    string s = "hello world\tpyb teacher\ngood job"s;
     vector<string> v = split(s);
     for (auto const &vi: v) {
         cout << vi << endl;
     }
+    cout << sizeof(string) << endl;
 }

15/09/c.cpp

@@ -0,0 +1,16 @@
+#include <string>
+#include <string_view>
+#include <stdexcept>
+#include <iostream>
+#include <iomanip>
+#include <locale>
+
+using namespace std;
+
+
+int main() {
+    string s = "你好";
+    wstring ws = L"你好";
+    cout << s.size() << endl;
+    cout << ws.size() << endl;
+}

specmacro/a.cpp

@@ -0,0 +1,12 @@
+#include <iostream>
+#include <string>
+#include "scienum.h"
+
+enum Color {
+    RED = 1, GREEN = 2, BLUE = 3, YELLOW = 4,
+};
+
+int main() {
+    std::cout << scienum::get_enum_name(YELLOW) << std::endl;
+    std::cout << scienum::enum_from_name<Color>("YELLOW") << std::endl;
+}

specmacro/scienum.h

@@ -0,0 +1,76 @@
+#pragma once
+
+#include <string>
+
+namespace scienum {
+
+namespace details {
+
+template <class T, T N>
+const char *get_enum_name_static() {
+#if defined(_MSC_VER)
+    return __FUNCSIG__;
+#else
+    return __PRETTY_FUNCTION__;
+#endif
+}
+
+template <bool Cond>
+struct my_enable_if {
+};
+
+template <>
+struct my_enable_if<true> {
+    typedef int type;
+};
+
+template <int Beg, int End, class F, typename my_enable_if<Beg == End>::type = 0>
+void static_for(F const &func) {
+}
+
+template <int Beg, int End, class F, typename my_enable_if<Beg != End>::type = 0>
+void static_for(F const &func) {
+    struct int_constant {
+        enum { value = Beg };
+    };
+    func(int_constant());
+    static_for<Beg + 1, End>(func);
+}
+
+}
+
+template <int Beg = 0, int End = 256, class T>
+std::string get_enum_name(T n) {
+    std::string s;
+    details::static_for<Beg, End + 1>([&] (auto i) {
+        if (n == (T)i.value) s = details::get_enum_name_static<T, (T)i.value>();
+    });
+    if (s.empty())
+        return std::to_string((int)n);
+#if defined(_MSC_VER)
+    auto pos = s.find(',');
+    pos += 1;
+    auto pos2 = s.find('>', pos);
+#else
+    auto pos = s.find("N = ");
+    pos += 4;
+    auto pos2 = s.find_first_of(";]", pos);
+#endif
+    s = s.substr(pos, pos2 - pos);
+    auto pos3 = s.find("::");
+    if (pos3 != s.npos)
+        s = s.substr(pos3 + 2);
+    return s;
+}
+
+template <class T, int Beg = 0, int End = 256>
+T enum_from_name(std::string const &s) {
+    for (int i = Beg; i < End; i++) {
+        if (s == get_enum_name((T)i)) {
+            return (T)i;
+        }
+    }
+    throw;
+}
+
+}

tools/concat.sh

@@ -5,5 +5,5 @@ for x in $*; do
     ffmpeg -i $x -vcodec copy -acodec copy -vbsf h264_mp4toannexb /tmp/t_$x.ts
 done
 cat /tmp/t_*.ts > /tmp/a_a.ts
-ffmpeg -i /tmp/a_a.ts -acodec copy -vcodec copy -absf aac_adtstoasc /tmp/out.mp4
+ffmpeg -y -i /tmp/a_a.ts -acodec copy -vcodec copy -absf aac_adtstoasc /tmp/out.mp4
 rm -f /tmp/a_a.ts /tmp/t_*.ts