19 struct ConstexprString {  struct
20   constexpr ConstexprString() : ConstexprString("") {}  in ConstexprString()  argument
21   constexpr ConstexprString(const char *p, std::size_t size) : data(new char[size+1]) {  in ConstexprString()  function
25   constexpr ConstexprString(const char *p) : ConstexprString(p, __builtin_strlen(p)) {}  in ConstexprString()  function
26   constexpr explicit ConstexprString(const char *p, const char *q) : data(nullptr) {  in ConstexprString()  function
33   constexpr ConstexprString(const ConstexprString &o) : ConstexprString(o.data) {}  in ConstexprString()  argument
34   constexpr ConstexprString(ConstexprString &&o) : data(o.data) { o.data = nullptr; }  in ConstexprString()  argument
35   constexpr ConstexprString &operator=(const ConstexprString &o) {  in operator =()  argument
36     return *this = ConstexprString(o);  in operator =()
38   constexpr ConstexprString &operator=(ConstexprString &&o) {  in operator =()  argument
44   constexpr ~ConstexprString() { delete[] data; }  in ~ConstexprString()  argument
47   friend constexpr ConstexprString operator+(const ConstexprString &a, const ConstexprString &b) {  in operator +()  argument
48     return ConstexprString(a.data, b.data);  in operator +()
50   friend constexpr ConstexprString &operator+=(ConstexprString &a, const ConstexprString &b) {  in operator +=()
53   friend constexpr bool operator==(const ConstexprString &a, const ConstexprString &b) {  in operator ==()
58 template<typename... T> constexpr void Format(ConstexprString &out, const char *fmt, T... args);
70       s = ConstexprString(str) + s;  in Arg()
81   constexpr Arg(const ConstexprString *s) : s("\"" + *s + "\"") {}  in Arg()
84   ConstexprString s;
87 template<typename... T> constexpr void Format(ConstexprString &out, const char *fmt, T... args) { /…  in Format()
93     out += ConstexprString(fmt, percent - fmt);  in Format()
102   out += ConstexprString(fmt);  in Format()
105 template<typename T> constexpr ConstexprString ToString(const T &t) { return Arg(t).s; }  in ToString()
110   ConstexprString s;
160   ConstexprString cs;  in errors()