As per the documentation, these are just synonyms. size() is there to be consistent with other STL containers (like vector, map, etc.) and length() is to be consistent with most peoples’ intuitive notion of character strings. People usually talk about a word, sentence or paragraph’s length, not its size, so length() is there to make … Read more
Magic Enum header-only library provides static reflection for enums (to string, from string, iteration) for C++17. #include <magic_enum.hpp> enum Color { RED = 2, BLUE = 4, GREEN = 8 }; Color color = Color::RED; auto color_name = magic_enum::enum_name(color); // color_name -> “RED” std::string color_name{“GREEN”}; auto color = magic_enum::enum_cast<Color>(color_name) if (color.has_value()) { // color.value() -> … Read more
Don’t modify strings. Work with them as lists; turn them into strings only when needed. >>> s = list(“Hello zorld”) >>> s [‘H’, ‘e’, ‘l’, ‘l’, ‘o’, ‘ ‘, ‘z’, ‘o’, ‘r’, ‘l’, ‘d’] >>> s[6] = ‘W’ >>> s [‘H’, ‘e’, ‘l’, ‘l’, ‘o’, ‘ ‘, ‘W’, ‘o’, ‘r’, ‘l’, ‘d’] >>> “”.join(s) ‘Hello … Read more
In JavaScript, strings are immutable, which means the best you can do is to create a new string with the changed content and assign the variable to point to it. You’ll need to define the replaceAt() function yourself: String.prototype.replaceAt = function(index, replacement) { return this.substring(0, index) + replacement + this.substring(index + replacement.length); } And use … Read more
This is what I do: q := `UPDATE mytable SET (I, Have, Lots, Of, Fields) = ` + `(‘suchalongvalue’, ` + `’thisislongaswell’, ` + `’wowsolong’, ` + `loooooooooooooooooooooooooong’)` db.Exec(q) I think it looks a lot cleaner
Every compile-time constant expression that is of type String will be put into the String pool. Essentially that means: if the compiler can (easily) “calculate” the value of the String without running the program, then it will be put into the pool (the rules are slightly more complicated than that and have a few corner … Read more
From the C11 standard draft N1570, §5.1.2.2.1/2: The parameters argc and argv and the strings pointed to by the argv array shall be modifiable by the program, and retain their last-stored values between program startup and program termination. They are modifiable. That means they are not string literals. But be careful: the upper citation only … Read more
Since the difference between u8string and string is that one is templated on char8_t and the other on char, the real question is what is the difference between using char8_t-based strings vs. char-based strings. It really comes down to this: type-based encoding. Any char-based string (char*, char[], string, etc) may be encoded in UTF-8. But … Read more
The new interpolated string syntax is part compiler magic and part runtime classes. Let’s go through all the scenarios and see what is actually happening. var s = $”{DateTime.Now}”; This gets compiled as this: string s = string.Format(“{0}”, DateTime.Now); See Try Roslyn for details. string s = $”{DateTime.Now}”; This gets compiled as this: string s … Read more
I’d consider it quite safe to assume that std::string allocates its storage contiguously. At the present time, all known implementations of std::string allocate space contiguously. Moreover, the current draft of C++ 0x (N3000) [Edit: Warning, direct link to large PDF] requires that the space be allocated contiguously (§21.4.1/5): The char-like objects in a basic_string object … Read more