Performance comparison of C++ inline functions in different scenarios

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If it is iterating when deleting an element, you must avoid using a failed iterator. ①The correct way is to use it=vec.erase(it), and use the valid iterator returned by erase to continue traversing; ② The recommended "erase-remove" idiom for batch deletion: vec.erase(std::remove_if(vec.begin(),vec.end(), condition), vec.end()), which is safe and efficient; ③ You can use a reverse iterator to delete from back to front, the logic is clear, but you need to pay attention to the condition direction. Conclusion: Always update the iterator with the erase return value, prohibiting operations on the failed iterator, otherwise undefined behavior will result.

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TheautokeywordinC deducesthetypeofavariablefromitsinitializer,makingcodecleanerandmoremaintainable.1.Itreducesverbosity,especiallywithcomplextypeslikeiterators.2.Itenhancesmaintainabilitybyautomaticallyadaptingtotypechanges.3.Itisnecessaryforunnamed

TagDispatching uses type tags to select the optimal function overload during the compilation period to achieve efficient polymorphism. 1. Use std::iterator_traits to obtain the iterator category tag; 2. Define multiple do_advance overload functions, and process random_access_iterator_tag, bidrectional_iterator_tag and input_iterator_tag respectively; 3. The main function my_advance calls the corresponding version based on the derived tag type to ensure that there is no runtime overhead during the compile period decision; 4. This technology is adopted by standard libraries such as std::advance, and supports extended customization.

This C single-linked example implements insert, traversal and delete operations. 1. Use insertAtBeginning to insert nodes in the head; 2. Use insertAtEnd to insert nodes in the tail; 3. Use deleteNode to delete nodes by value and return boolean results; 4. Use display method to traverse and print the linked list; 5. Free all node memory in the destructor to prevent leakage; the final program output verifies the correctness of these operations, fully demonstrating the basic management method of dynamic data structures.

Use the seekg and tellg methods of std::ifstream to obtain file size across platforms. By opening a binary file and positioning it to the end, use tellg() to return the number of bytes; 2. It is recommended to use std::filesystem::file_size for C 17 and above. The code is concise and errors are handled through exceptions. The C 17 standard must be enabled; 3. On POSIX systems, the stat() function can be used to efficiently obtain file size, which is suitable for performance-sensitive scenarios. The appropriate method should be selected based on the compiler and platform, and std::filesystem should be used first (if available), otherwise use ifstream to ensure compatibility, or use st on Unix systems

std::accumulate is a common algorithm for data accumulation provided by STL. It is located in a header file. Common uses include: 1. Find the sum of arrays or containers, such as summing vector elements; 2. Splicing strings, and implementing string concatenation by specifying the initial value of std::string(""); 3. Custom operation functions or Lambda expressions, such as calculating product, conditional filtering, etc. When using it, pay attention to type matching, iterator interval correctness and initial value selection to avoid errors.