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using uint for non negative numbers
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foo290
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@ -59,82 +59,82 @@ namespace others {
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* @namespace lru_cache
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* @brief Implementation of LRU caching algorithm
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*/
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namespace lru_cache {
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namespace lru_cache {
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/**
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* @brief LRU cache class
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*/
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class LRUCache {
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int pageFrame; ///< Page frame, or total size of the cache.
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std::list<int> cache; ///< Cache linked list (using the STL)
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std::unordered_map<int, std::list<int>::iterator>
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pageMap; ///< Hash map containing pages and their addresses
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class LRUCache {
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uint64_t pageFrame; ///< Page frame, or total size of the cache.
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std::list<uint64_t> cache; ///< Cache linked list (using the STL)
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std::unordered_map<uint64_t , std::list<uint64_t >::iterator>
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pageMap; ///< Hash map containing pages and their addresses
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int hits = 0; ///< Total number of hits, or total number of times a page
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///< was found in cache.
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int pageFault = 0; ///< Total number of miss/page fault, or total number of
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///< times a page was not found in cache
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uint64_t hits = 0; ///< Total number of hits, or total number of times a page
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///< was found in cache.
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uint64_t pageFault = 0; ///< Total number of miss/page fault, or total number of
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///< times a page was not found in cache
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public:
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/**
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* @brief Constructor, Initialize thee LRU class with page frame.
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* @param pf Page frame or total size of cache.
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* */
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explicit LRUCache(int pf) { pageFrame = pf; }
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public:
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/**
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* @brief Constructor, Initialize thee LRU class with page frame.
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* @param pf Page frame or total size of cache.
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* */
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explicit LRUCache(uint64_t pf) { pageFrame = pf; }
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/**
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* @brief Refer to a page, or request a page from memory.
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* @param page The page that you are referring to.
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* @returns void
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* */
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void refer(int page) {
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// If the page requested not in cache.
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if (pageMap.find(page) == pageMap.end()) {
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pageFault++; ///< Increase the page fault by one.
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/**
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* @brief Refer to a page, or request a page from memory.
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* @param page The page that you are referring to.
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* @returns void
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* */
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void refer(uint64_t page) {
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// If the page requested not in cache.
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if (pageMap.find(page) == pageMap.end()) {
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pageFault++; ///< Increase the page fault by one.
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// Check if the cache is full
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if (cache.size() == pageFrame) {
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// delete the last page from cache
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int lastPage = cache.back();
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cache.pop_back();
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pageMap.erase(lastPage);
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// Check if the cache is full
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if (cache.size() == pageFrame) {
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// delete the last page from cache
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uint64_t lastPage = cache.back();
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cache.pop_back();
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pageMap.erase(lastPage);
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}
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}
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// The requested page is in the cache
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else {
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hits++;
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// present in cache, erase from current position to bring in front
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cache.erase(pageMap[page]);
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}
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// Push it in the front of the cache and update the page reference in
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// page map.
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cache.push_front(page);
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pageMap[page] = cache.begin();
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}
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}
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// The requested page is in the cache
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else {
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hits++;
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// present in cache, erase from current position to bring in front
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cache.erase(pageMap[page]);
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}
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// Push it in the front of the cache and update the page reference in
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// page map.
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cache.push_front(page);
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pageMap[page] = cache.begin();
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}
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/**
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* @brief A function to display the current cache
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* @returns Void
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* */
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void display() {
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for (int &it : cache) {
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std::cout << it << " ";
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}
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std::cout << std::endl;
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}
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/**
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* @brief A function to get page hits
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* @returns int
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* */
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int getHits() const { return hits; }
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/**
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* @brief A function to get page fault
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* @returns int
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* */
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int getPageFault() const { return pageFault; }
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};
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/**
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* @brief A function to display the current cache
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* @returns Void
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* */
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void display() {
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for (uint64_t &it : cache) {
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std::cout << it << " ";
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}
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std::cout << std::endl;
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}
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/**
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* @brief A function to get page hits
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* @returns int
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* */
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uint64_t getHits() const { return hits; }
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/**
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* @brief A function to get page fault
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* @returns int
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* */
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uint64_t getPageFault() const { return pageFault; }
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};
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} // namespace lru_cache
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} // namespace lru_cache
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} // namespace others
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namespace lru_tests {
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@ -143,11 +143,11 @@ namespace lru_tests {
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* @tparam T Type of the given message.
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* @returns void
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* */
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template <typename T>
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void log(T msg) {
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// It's just to avoid writing cout and endl
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std::cout << "[TESTS] : ---> " << msg << std::endl;
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}
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template <typename T>
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void log(T msg) {
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// It's just to avoid writing cout and endl
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std::cout << "[TESTS] : ---> " << msg << std::endl;
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}
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/**
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* @brief A simple test case
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@ -155,26 +155,26 @@ void log(T msg) {
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* miss
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* @returns void
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* */
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static void test_1() {
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int expected_hits = 2;
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int expected_pageFault = 4;
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static void test_1() {
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uint64_t expected_hits = 2;
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uint64_t expected_pageFault = 4;
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log("Running Test-1...");
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log("Running Test-1...");
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others::lru_cache::LRUCache cache(4);
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cache.refer(1);
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cache.refer(2);
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cache.refer(5);
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cache.refer(1);
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cache.refer(4);
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cache.refer(5);
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others::lru_cache::LRUCache cache(4);
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cache.refer(1);
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cache.refer(2);
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cache.refer(5);
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cache.refer(1);
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cache.refer(4);
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cache.refer(5);
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log("Checking assert statement...");
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assert(cache.getHits() == expected_hits &&
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cache.getPageFault() == expected_pageFault);
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log("Assert successful!");
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log("Test-1 complete!");
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}
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log("Checking assert statement...");
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assert(cache.getHits() == expected_hits &&
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cache.getPageFault() == expected_pageFault);
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log("Assert successful!");
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log("Test-1 complete!");
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}
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/**
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* @brief A test case contains hits more than cache size
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@ -182,26 +182,26 @@ static void test_1() {
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* miss
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* @returns void
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* */
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static void test_2() {
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int expected_hits = 4;
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int expected_pageFault = 2;
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static void test_2() {
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uint64_t expected_hits = 4;
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uint64_t expected_pageFault = 2;
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log("Running Test-2...");
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log("Running Test-2...");
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others::lru_cache::LRUCache cache(4);
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cache.refer(1);
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cache.refer(1);
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cache.refer(1);
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cache.refer(1);
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cache.refer(1);
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cache.refer(5);
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others::lru_cache::LRUCache cache(4);
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cache.refer(1);
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cache.refer(1);
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cache.refer(1);
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cache.refer(1);
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cache.refer(1);
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cache.refer(5);
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log("Checking assert statement...");
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assert(cache.getHits() == expected_hits &&
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cache.getPageFault() == expected_pageFault);
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log("Assert successful!");
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log("Test-2 complete!");
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}
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log("Checking assert statement...");
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assert(cache.getHits() == expected_hits &&
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cache.getPageFault() == expected_pageFault);
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log("Assert successful!");
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log("Test-2 complete!");
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}
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/**
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* @brief A simple test case
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@ -209,38 +209,38 @@ static void test_2() {
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* miss
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* @returns void
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* */
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static void test_3() {
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int expected_hits = 1;
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int expected_pageFault = 5;
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static void test_3() {
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uint64_t expected_hits = 1;
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uint64_t expected_pageFault = 5;
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log("Running Test-3...");
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log("Running Test-3...");
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others::lru_cache::LRUCache cache(4);
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cache.refer(1);
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cache.refer(2);
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cache.refer(3);
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cache.refer(4);
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cache.refer(5);
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cache.refer(5);
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others::lru_cache::LRUCache cache(4);
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cache.refer(1);
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cache.refer(2);
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cache.refer(3);
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cache.refer(4);
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cache.refer(5);
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cache.refer(5);
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log("Checking assert statement...");
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assert(cache.getHits() == expected_hits &&
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cache.getPageFault() == expected_pageFault);
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log("Assert successful!");
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log("Test-3 complete!");
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}
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log("Checking assert statement...");
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assert(cache.getHits() == expected_hits &&
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cache.getPageFault() == expected_pageFault);
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log("Assert successful!");
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log("Test-3 complete!");
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}
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/**
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* @brief A function to invoke all test cases
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* @returns void
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* */
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static void run_tests() {
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test_1();
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test_2();
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test_3();
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log("");
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log("TESTS COMPLETED!");
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}
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static void run_tests() {
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test_1();
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test_2();
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test_3();
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log("");
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log("TESTS COMPLETED!");
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}
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} // namespace lru_tests
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/**
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