initial commit

oscar64/autotest/opp_optional.cpp

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+#include <opp/optional.h>
+#include <opp/string.h>
+
+#include <assert.h>
+#include <opp/optional.h>
+#include <opp/string.h>
+
+using opp::optional;
+using opp::string;
+
+optional<int> isqrt(int i)
+{
+	if (i < 0)
+		return optional<int>();
+	else
+		return i;
+}
+
+optional<string> ssqrt(int i)
+{
+	if (i < 0)
+		return optional<string>();
+	else
+		return opp::to_string(i);
+}
+
+int main(void)
+{
+	int sum = 0;
+	for(int i=-10; i<=10; i++)
+	{
+		for (auto s : isqrt(i))
+			sum += s;
+	}
+	assert(sum == 55);
+
+	sum = 0;
+	for(int i=-10; i<=10; i++)
+	{
+		if (auto s = ssqrt(i))
+			sum += s->to_int();
+	}
+	assert(sum == 55);
+
+	sum = 0;
+	for(int i=-10; i<=10; i++)
+	{
+		for (auto s : ssqrt(i))
+			sum += s.to_int();
+	}
+	assert(sum == 55);
+
+	sum = 0;
+	for(int i=-10; i<=10; i++)
+	{
+		auto s = ssqrt(i);
+		auto t = s;
+
+		if (t)
+			sum += t->to_int();
+	}
+	assert(sum == 55);
+}