Can I compare a std::string with a std::string_view, is that any problematic?

whats that

he purpose of any and all kinds of "string reference" and "array reference" proposals is to avoid copying data which is already owned somewhere else and of which only a non-mutating view is required. The string_view in question is one such proposal; there were earlier ones called string_ref and array_ref, too. The idea is always to store a pair of pointer-to-first-element and size of some existing data array or string. Such a view-handle class could be passed around cheaply by value and would offer cheap substringing operations (which can be implemented as simple pointer increments and size adjustments). Many uses of strings don't require actual owning of the strings, and the string in question will often already be owned by someone else. So there is a genuine potential for increasing the efficiency by avoiding unneeded copies (think of all the allocations and exceptions you can save). The original C strings were suffering from the problem that the null terminator was part of the string APIs, and so you couldn't easily create substrings without mutating the underlying string (a la strtok). In C++, this is easily solved by storing the length separately and wrapping the pointer and the size into one class. The one major obstacle and divergence from the C++ standard library philosophy that I can think of is that such "referential view" classes have completely different ownership semantics from the rest of the standard library. Basically, everything else in the standard library is unconditionally safe and correct (if it compiles, it's correct). With reference classes like this, that's no longer true. The correctness of your program depends on the ambient code that uses these classes. So that's harder to check and to teach.

why did you copy this wall of text

Can I compare a std::string with a std::string_view, is that any problematic?

Beacuse I didnt want to type

What is the purpose of struct enums union??

What is the purpose of struct enums union??

Can std::string be overflowed?

I think I somehow managed to overflow it…

"overflowing" a std::string seems quite weird, because the only way you can "overflow" it is by running out of memory

Just overflowing with \0 seems to not have that effect

I have no idea how else it overwrites wrong data

Who has a resource on how to learn C with Visual studio

I'm writing a while loop, that should show to the user some kind of menu, where the user can type his choice, or 'enter' to use the default option. In order to do so I'm using an fgets function, and I would like to clear the buffer after that, in order to not compromise the further selections. If I use something based on getchar() my program enter in some kind of loop and stops working right after the fgets Here is a sample of my code https://pad.riseup.net/p/-skZv-GPDMwV1oJAYUGU-tmp

Can't say much. Code is not enough.

I'm writing a while loop, that should show to the user some kind of menu, where the user can type his choice, or 'enter' to use the default option. In order to do so I'm using an fgets function, and I would like to clear the buffer after that, in order to not compromise the further selections. If I use something based on getchar() my program enter in some kind of loop and stops working right after the fgets Here is a sample of my code https://pad.riseup.net/p/-skZv-GPDMwV1oJAYUGU-tmp

Use gnu readline or any operating system specific extension

[In reply to Cooooooooooom'); DROP TABLE ALL; GNU/Yuki Nagato జ్ఞాజ్ఞాజ్ఞాజ్ఞ (長門有希) XDA: @anupritaisno1 @glassrom I use Arch btw జ్ఞాజ్ఞాజ్ఞ] then, how can I write a program that behave, for example, like fdisk? It shows to you the default option, but lets you to use a custom one. I'd like to do that

[In reply to Cooooooooooom'); DROP TABLE ALL; GNU/Yuki Nagato జ్ఞాజ్ఞాజ్ఞాజ్ఞ (長門有希) XDA: @anupritaisno1 @glassrom I use Arch btw జ్ఞాజ్ఞాజ్ఞ] then, how can I write a program that behave, for example, like fdisk? It shows to you the default option, but lets you to use a custom one. I'd like to do that

Std::vector<int> snail(std::vector<std::vector<int>> snail_map) { //code or no code shows the same thing } Int main() { Snail({{1, 2, 3}, {4, 5, 6}}): } This is showing "Double free or corruption (out)" Why? And how to solve thus

Hello. Why c compiller (gcc) compile it, but c++ (g++) no? I wanna use c files inside c++ without changes. It is possible? p.s. This example just show the problem, therefore don't suggest fix c code if it not critical warning in c and need only for work this in c++ "extern".

Gcc works with only c and g++ only works with c++

I'm writing a while loop, that should show to the user some kind of menu, where the user can type his choice, or 'enter' to use the default option. In order to do so I'm using an fgets function, and I would like to clear the buffer after that, in order to not compromise the further selections. If I use something based on getchar() my program enter in some kind of loop and stops working right after the fgets Here is a sample of my code https://pad.riseup.net/p/-skZv-GPDMwV1oJAYUGU-tmp

Hello. Why c compiller (gcc) compile it, but c++ (g++) no? I wanna use c files inside c++ without changes. It is possible? p.s. This example just show the problem, therefore don't suggest fix c code if it not critical warning in c and need only for work this in c++ "extern".