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cpp
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int quote_delims = 100'000'000;
int float_delims = 100.00'00;
int hex_delims = 0xFF'Fa12;
int bin_delims = 0b10'1000;
// string literal with encoding-prefix
char str1[] = u8"UTF-8 string";
char16_t str2[] = u"UTF-16 string";
char32_t str3[] = U"UTF-32 string";
// Raw string literal
char raw_str1[] = R"(foo
bar
baz)";
char raw_str2[] = R"delim(\w+ \d+)delim";
char16_t raw_str3[] = uR"(\w+ \d+)";
// time literal
#include <chrono>
using namespace std::chrono_literals;
auto oneDecade = 10y;
auto oneYear = 365.2'425d;
auto oneDay = 24h;
auto halfAnHour = 30min;
auto oneYearInMins = 525'949.2min;
auto halfAnHour = 0.5h;
auto oneMin = 60s;
auto oneSec = 1000ms;
auto oneMilliSec = 1000us;
auto oneMicroSec = 1000ns;
// complex literal
#include <complex>
using namespace std::complex_literals;
auto complexNumber = 1 + 1i;
auto complexNumberl = 1 + 1il;
auto complexNumberf = 1 + 1if;
// null pointer
int *a = nullptr;
// bit field
struct S {
// will usually occupy 2 bytes:
// 3 bits: value of b1
// 2 bits: unused
// 6 bits: value of b2
// 2 bits: value of b3
// 3 bits: unused
unsigned char b1 : 3, : 2, b2 : 6, b3 : 2;
};
std::cout << sizeof(S) << '\n'; // usually prints 2
// loops
int n = 10;
while (n --> 0) {
std::cout << n << '\n';
}
for (int &i : {1, 2, 3, 4}) {
std::cout << i << '\n';
}
// decltype
int num = 1;
decltype(num) total = num;
struct A { double x; };
const A *a = A {0};
decltype(a->x) ax = a->x;
// strongly typed enums
enum class Day {
Mon, Tue, Wed, Thur, Fri, Sat, Sun
};
Day today = Day::Mon;
// lambda function
auto add = [](int x, int y) { return x + y; };
auto noParam = [] { return 5; };
auto invokeNow = [](int x) { return x * 5; }(1);
int captureMe = 5;
auto byCopy = [captureMe] { return captureMe; };
auto byRef = [&captureMe] { return captureMe; };
auto allByCopy = [=] { return captureMe; };
auto allByRef = [&] { return captureMe; };
auto increment = [y = 1](int x) { return x + y; };
double distance = [](double x, double y, double xx, double yy) -> double {
return abs(x-xx) + abs(y-yy);
};
// templates
namespace N
{
template<class T>
class Y // template definition
{
void mf() { }
};
}
template class N::Y<char*>;
template void N::Y<double>::mf();
template struct Z<double>;
template<typename T> concept C1 = sizeof(T) != sizeof(int);
template<C1 T> struct S1 { };
template<C1 T> using Ptr = T*;
template <typename, typename...>
template<class...> struct Tuple { };
template<typename ...Ts> void f(Ts...) {}
// variadic template
template<class F, class... Args>
void forward_args(F f, Args... args) {
f(std::forward<Args>(args)...);
}
// using auto
template<auto F = requires { foo(); }>
void func();
template<auto F = []{}>
void func();
// namespace
namespace printing {
inline namespace latest {
using std::cout;
void print() {
cout << "Latest print\n";
}
}
namespace old {
void print() {
::printf("Old print\n");
}
}
}
printing::print();
printing::latest::print();
printing::old::print();
namespace oldPrint = printing::old;
oldPrint::print();
// attribute
[[noreturn]] void throwError() { throw "error"; }
[[deprecated("useless")]] void doNothing() {}
namespace std {
class thread {
public:
// types:
class id;
typedef void *native_handle_type;
// construct/copy/destroy:
thread() noexcept;
template <class F, class ...Args> explicit thread(F&& f, Args&&... args);
~thread();
thread(const thread&) = delete;
thread(thread&&) noexcept;
thread& operator=(const thread&) = delete;
thread& operator=(thread&&) noexcept;
// members:
void swap(thread&) noexcept;
bool joinable() const noexcept;
void join();
void detach();
id get_id() const noexcept;
native_handle_type native_handle();
// static members:
static unsigned hardware_concurrency() noexcept;
};
}
// try-block
try {
throw std::runtime_error("Runtime error!");
} catch (std::exception& e) {
std::cerr << e.what() << std::endl;
}
constexpr int factorial(int n) {
return n > 0 ? n * factorial(n - 1) : 1;
}
/* foo */ #if 0
this is commented
#endif
/* it shouldn't hang */ /* trying to lex this */
/*{"ahg/awn/xan?", HB_TAG('A','G','W',' ')},*/ /* Agaw */
/*{"gsw?/gsw-FR?", HB_TAG('A','L','S',' ')},*/ /* Alsatian */
/*{"krc", HB_TAG('B','A','L',' ')},*/ /* Balkar */
/*{"??", HB_TAG('B','C','R',' ')},*/ /* Bible Cree */
/*{"sgw?", HB_TAG('C','H','G',' ')},*/ /* Chaha Gurage */
/*{"acf/gcf?", HB_TAG('F','A','N',' ')},*/ /* French Antillean */
/*{"vls/nl-be", HB_TAG('F','L','E',' ')},*/ /* Flemish */
/*{"enf?/yrk?", HB_TAG('F','N','E',' ')},*/ /* Forest Nenets */
/*{"fuf?", HB_TAG('F','T','A',' ')},*/ /* Futa */
/*{"ar-Syrc?", HB_TAG('G','A','R',' ')},*/ /* Garshuni */
/*{"cfm/rnl?", HB_TAG('H','A','L',' ')},*/ /* Halam */
/*{"ga-Latg?/Latg?", HB_TAG('I','R','T',' ')},*/ /* Irish Traditional */
/*{"krc", HB_TAG('K','A','R',' ')},*/ /* Karachay */
/*{"alw?/ktb?", HB_TAG('K','E','B',' ')},*/ /* Kebena */
/*{"Geok", HB_TAG('K','G','E',' ')},*/ /* Khutsuri Georgian */
/*{"kca", HB_TAG('K','H','K',' ')},*/ /* Khanty-Kazim */
/*{"kca", HB_TAG('K','H','S',' ')},*/ /* Khanty-Shurishkar */
class Base
{
public:
Base () = default;
virtual ~Base () = default;
virtual void foo () = 0;
};
class Derived final : public Base
{
public:
Derived () = default;
virtual ~Derived () = default;
virtual void foo () override
{
auto a = 1 + 2;
}
};
#define foo bar
#define baz zot
class Highlighter : public QSyntaxHighlighter
{
class InnerClass {}
Q_OBJECT
public:
Highlighter(QTextDocument *parent = 0);
protected:
void highlightBlock(const QString &text);
private:
struct HighlightingRule
{
QRegExp pattern;
QTextCharFormat format;
};
QVector<HighlightingRule> highlightingRules;
QRegExp commentStartExpression;
QRegExp commentEndExpression;
QTextCharFormat keywordFormat;
QTextCharFormat classFormat;
QTextCharFormat singleLineCommentFormat;
QTextCharFormat multiLineCommentFormat;
QTextCharFormat quotationFormat;
QTextCharFormat functionFormat;
};
switch (foo) {
case Foo::kBar:
break;
}
// modules
module;
import std;
export module Shapes;
export struct Shape {
Shape(int x, int y) : m_x(x), m_y(y) {};
int m_x;
int m_y;
}