A string_view is a C++ class template that is a non-owning reference to a string.
Reference: http://en.cppreference.com/w/cpp/experimental/basic_string_view
Questions tagged [string-view]
215 questions
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std::string_view issues on GCC8
I have some simple code using std::string_view which works great in gcc10, but not in gcc8.
std::string_view was added to C++17 in GCC 7, so it should be possible to use this.
#include
using sv = std::string_view;
sv ParseScheme(const…
Stewart
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1 answer
C++ - How are the arguments passed around in these lambdas?
I am taking a look at an Open Source repo with this file written in C++. The two functions use lambdas and callbacks, and I just want to better understand the order of operations and how they work together.
How is this block executed when…
monk234
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3 answers
Can I repeat a std::string_view without copying when printing indentation?
I have a simple scene in C++ code.
I want to get a long string containing some repeated std::string_view; is there a way to achieve this without copying the string?
#include
#include
struct Logger {
static inline…
Gtylcara
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Mutable alternative for std::string_view?
Is there a mutable alternative to std::string_view?
I need a container that stores a pointer and a size e.g. for passing it to a function instead of passing a pointer and a size. I know it's easy enough to implement it myself; I just want to know if…
SMMB
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How to instantiatiate a std::basic_string_view with custom class T, I got is_trivial_v<_CharT> assert error
I would like to construct a std::basic_string_view, but the T is the customized class.
Here is the test code:
#include
#include
struct Token
{
Token();
Token(const Token& other)
{
lexeme =…
ollydbg23
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1 answer
C++ CRTP: how to extend the std::string_view to std::basic_string_view by passing template parameters
I'm designing a simple parser, which matches patterns. The code use some CRTP C++ design pattern, I have simplified the code as below.
#include
template
struct parser_base {
constexpr auto…
ollydbg23
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2 answers
What is the correct way to “clear" a std::string_view?
I see this post: c++ - Why doesn't std::string_view have assign() and clear() methods? - Stack Overflow, so string_view does not contain clear function.
But in my case, I have a string_view as a class member variable, and sometimes, I would like to…
ollydbg23
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1 answer
Access a string view of an object inside a vector of interfaces C++
I am storing different objects which inherit from the same interface inside a single vector. Those objects have their name stored as a constant string view, which gets its value even before the object gets instantiated. I am able to easily retrieve…
Frogieder
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1 answer
Force decay of string literals (const char array) to ptr
In the following example I try to emplace_back() a string literal and a string_view into an std::pair of string_views. However, my problem is that emplace_back() takes up the string literal as a const char array and doesn't decay it to a pointer.…
glades
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2 answers
How to use std::string_view with reverse iterators?
I am trying to create a very simple function:
bool is_palidrome(const std::string& s)
{
std::string r(s.crbegin(), s.crend());
return s==r;
}
In order to avoid unnecessary allocations
I thought I could use a string_view:
bool…
apelle
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1 answer
Will it be a good practice if I replace function return value from std::string to std::string_view?
I am learning c++17, I found std::string_view is a new keyword, which can improve std::string performance.
It can avoid copy, according to my understanding.
I have a lot of function, which return std::string, like this:
std::string handle_str(const…
nothingisme
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1 answer
Is it possible to set default param value for the std::string_view?
Is it safe to set an empty default value for the std::string_view?
void func(std::string_view arg = {} )
Hardwired
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Join a container of `std::string_view`
How can you concisely combine a container of std::string_views?
For instance, boost::algorithm::join is great, but it only works for std::string.
An ideal implementation would be
static std::string_view unwords(const std::vector&…
gust
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std::string_view constructor & validity outside the place it was defined
Given the following code
std::string_view foo(){
std::string_view sv("ABC");
return sv;
}
int main(){
std::string_view svv = foo();
}
Is it safe to say that since "ABC" is stored in the static area of the stack, svv is valid since the…
Alberto Tiraboschi
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2 answers
What is the name of the feature/syntax that combines curly braces, ampersand and length of character sequences?
I was reading Chapter 9 of the 2nd edition of A Tour of C++ by Bjarne Stroustrup and was puzzled by the use of {&king[0],2} where king is a string variable. I get that it returns the first 2 strings but I don't know what the name is for this to look…
heretoinfinity
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