From 95bfddc4329119535cf2fb47bef3c1b87f61e411 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Tue, 6 Sep 2022 12:24:03 +0200
Subject: tis  6 sep 2022 12:24:03 CEST

---
 C++/Friend Operator.wiki     | 30 ++++++++++++++++++++++++
 C++/Threeway Comparison.wiki | 43 +++++++++++++++++++++++++++++++++++
 C++/Time Header.wiki         | 54 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 127 insertions(+)
 create mode 100644 C++/Friend Operator.wiki
 create mode 100644 C++/Threeway Comparison.wiki
 create mode 100644 C++/Time Header.wiki

(limited to 'C++')

diff --git a/C++/Friend Operator.wiki b/C++/Friend Operator.wiki
new file mode 100644
index 0000000..a5e6730
--- /dev/null
+++ b/C++/Friend Operator.wiki	
@@ -0,0 +1,30 @@
+= Friend Operator =
+
+{{{c++
+#include <iostream>
+
+class T {
+	int x;
+
+public:
+	T (int x);
+
+	friend std::ostream& operator<<(std::ostream&, const T&);
+};
+
+T::T (int x) {
+	this->x = x;
+}
+
+
+std::ostream& operator<<(std::ostream& out, const T& t) {
+	out << "T {" << t.x << "}";
+	return out;
+}
+
+int main () {
+	T t(10);
+
+	std::cout << t << std::endl;
+}
+}}}
diff --git a/C++/Threeway Comparison.wiki b/C++/Threeway Comparison.wiki
new file mode 100644
index 0000000..58edd84
--- /dev/null
+++ b/C++/Threeway Comparison.wiki	
@@ -0,0 +1,43 @@
+Compile with `c++ -std=c++=20 main.cpp`.
+
+Tests the spaceship operator.
+
+{{{c++
+#include <iostream>
+#include <compare>
+#include <sstream>
+
+int str_to_int(const char* s) {
+	int ret;
+	std::basic_istringstream<char> is(s);
+	is >> ret;
+	return ret;
+}
+
+int main(int argc, char* argv[]) {
+	if (argc < 3) {
+		std::cerr << "Give at least 2 arguments" << std::endl;
+		return 1;
+	}
+
+	int a, b;
+
+	a = str_to_int(argv[1]);
+	b = str_to_int(argv[2]);
+
+	std::cout << a << " <=> " << b << std::endl;
+	std::strong_ordering result = a <=> b;
+	if (std::is_lt(result)) {
+		std::cout << "LT";
+	} else if (std::is_gt(result)) {
+		std::cout << "GT";
+	} else if (std::is_eq(result)) {
+		std::cout << "EQ";
+	} else {
+		std::cout << "error";
+	}
+
+	std::cout << std::endl;
+	return 0;
+}
+}}}
diff --git a/C++/Time Header.wiki b/C++/Time Header.wiki
new file mode 100644
index 0000000..abc1b12
--- /dev/null
+++ b/C++/Time Header.wiki	
@@ -0,0 +1,54 @@
+= Time Header =
+
+A silly header which allows timestamps to be written in english.
+
+{{{c++
+#pragma once
+
+#include <ostream>
+
+enum timetype {
+	_day, _hour, _minute, _second
+};
+
+class Time {
+private:
+
+	int _days = 0;
+	int _hours = 0;
+	int _minutes = 0;
+	int _seconds = 0;
+
+public:
+	Time() { };
+	Time(int n, timetype type);
+
+	int to_seconds() const;
+
+	friend std::ostream& operator<<(std::ostream&, const Time&);
+	friend Time operator * (int, Time);
+
+	Time operator +  (const Time&);
+	Time operator ,  (const Time& t) { return *this + t; }
+	Time operator && (const Time& t) { return *this + t; }
+};
+
+#define days * Time(1, _day)
+#define day days
+#define hours * Time(1, _hour)
+#define hour hours
+#define minutes * Time(1, _minute)
+#define minute minutes
+#define seconds * Time(1, _second)
+#define second seconds
+
+int main() {
+    std::cout
+    << 5 days                            << std::endl
+    << 7 minutes                         << std::endl
+    << (5 days and 3 seconds)            << std::endl
+    << (7 days, 7 minutes and 3 seconds) << std::endl
+    << (9 hours and 1 second)            << std::endl
+    ;
+}
+}}}
-- 
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