testcode.git

Add a lifetime object to test scopes
Parent 1f815c9
dblume

dblume commited on 2024-09-13 20:15:11
Showing 3 changed files, with 77 additions and 1 deletions.

product/Makefile
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@@ -7,7 +7,7 @@ OBJDIR=obj
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 SOURCES=main.cpp main_helper.cpp ui/widget.cpp scoped_set_adder.cpp \
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 	thread_with_lambda.cpp thread_manager.cpp deadlock/deadlock.cpp \
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-	next_power_of_two.cpp mmmm.cpp copilot_serialize.cpp
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+	next_power_of_two.cpp mmmm.cpp copilot_serialize.cpp lifetime.cpp
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 # //OBJECTS=$(OBJDIR)$(SOURCES:.cpp=.o)
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 OBJECTS=$(foreach bname, $(basename $(SOURCES)), $(OBJDIR)/$(bname).o)
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 EXECUTABLE=testcode
product/lifetime.cpp
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+#include "lifetime.h"
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+#include <cstdio>
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+#include <array>
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+// From C++ Weekly with Jason Turner
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+// https://www.youtube.com/watch?v=6SaUwqw4ueE
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+//
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+// Test with:
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+// ls -1 lifetime* | entr sh -c 'g++ -Wall -std=c++17 lifetime.cpp && valgrind -q --leak-check=yes --show-leak-kinds=all ./a.out'
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+
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+Lifetime::Lifetime()
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+{
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+    std::puts("Lifetime() // default ctor");
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+}
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+
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+Lifetime::~Lifetime()
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+{
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+    std::puts("~Lifetime() // destructor");
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+}
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+
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+Lifetime::Lifetime(const Lifetime &)
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+{
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+    std::puts("Lifetime(const Lifetime &) // copy ctor");
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+}
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+
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+Lifetime::Lifetime(Lifetime &&)
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+{
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+    std::puts("Lifetime(Lifetime &&) // move ctor");
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+}
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+
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+Lifetime &Lifetime::operator=(Lifetime &&)
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+{
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+    std::puts("operator=(const Lifetime &&) // move assign");
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+    return *this;
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+}
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+
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+Lifetime &Lifetime::operator=(const Lifetime &)
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+{
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+    std::puts("operator=(const Lifetime &) // copy assign");
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+    return *this;
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+}
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+
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+/*
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+int main()
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+{
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+#if 0
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+    Lifetime l1;
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+    Lifetime l2;
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+    std::array<Lifetime, 2> a{l1, l2};
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+#elif 1
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+    Lifetime l1;
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+    Lifetime l2;
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+    std::array<Lifetime, 2> a{std::move(l1), std::move(l2)};
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+#else
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+    auto make_lifetime = [](const int value) {
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+        // Benefits from return value optimization
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+        Lifetime l;
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+        l.data_ = value;
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+        return l;
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+    };
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+
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+    std::array<Lifetime, 2> a{make_lifetime(42), make_lifetime(43)};
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+#endif
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+}
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+*/
product/lifetime.h
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+#pragma once
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+
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+struct Lifetime {
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+    Lifetime();
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+    ~Lifetime();
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+    Lifetime(const Lifetime &);
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+    Lifetime(Lifetime &&);
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+    Lifetime &operator=(Lifetime &&);
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+    Lifetime &operator=(const Lifetime &);
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+
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+    int data_;
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+};
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