struct from_range_t { explicit from_range_t() = default; };
(since C++23)inline constexpr std::from_range_t from_range {};
(since C++23)std::from_range is a disambiguation tag that can be passed to the constructors of the suitable containers to indicate that the contained member is range constructed.
The corresponding type std::from_range_t can be used in the constructor's parameter list to match the intended tag.
The following standard library types use std::from_range_t type in their constructors:
vector from a range
std::vector<T,Allocator>) constructs the inplace_vector from a range
std::inplace_vector<T,N>) constructs the hive from a range
Template:cpp/container/hive/title) constructs the deque from a range
std::deque<T,Allocator>) constructs the forward_list from a range
std::forward_list<T,Allocator>) constructs the list from a range
std::list<T,Allocator>) constructs the set from a range
std::set<Key,Compare,Allocator>) constructs the map from a range
std::map<Key,T,Compare,Allocator>) constructs the multiset from a range
std::multiset<Key,Compare,Allocator>) constructs the multimap from a range
std::multimap<Key,T,Compare,Allocator>) constructs the unordered_set from a range
std::unordered_set<Key,Hash,KeyEqual,Allocator>) constructs the unordered_map from a range
std::unordered_map<Key,T,Hash,KeyEqual,Allocator>) constructs the unordered_multiset from a range
std::unordered_multiset<Key,Hash,KeyEqual,Allocator>) constructs the unordered_multimap from a range
std::unordered_multimap<Key,T,Hash,KeyEqual,Allocator>) constructs the priority_queue from a range
std::priority_queue<T,Container,Compare>) constructs the queue from a range
std::queue<T,Container>) constructs the stack from a range
std::stack<T,Container>) constructs the flat_set from a range
std::flat_set<Key,Compare,KeyContainer>) constructs the flat_map from a range
std::flat_map<Key,T,Compare,KeyContainer,MappedContainer>) constructs the flat_multiset from a range
std::flat_multiset<Key,Compare,KeyContainer>) constructs the flat_multimap from a range
std::flat_multimap<Key,T,Compare,KeyContainer,MappedContainer>) Strings library constructs the basic_string from a range
std::basic_string<CharT,Traits,Allocator>) [edit] Notes [edit] Example
#include <cassert>
#include <string>
int main()
{
#ifdef __cpp_lib_containers_ranges
auto const range = {0x43, 43, 43};
std::string str{std::from_range, range}; // uses tagged constructor
assert(str == "C++");
#endif
}[edit] See also
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