std::inplace_vector<T,N>::try_push_back
From cppreference.com
< cpp | container | inplace vector
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Containers library
(C++17)
(C++11)
(C++26)
(C++26)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++23)
(C++23)
(C++23)
(C++23)
(C++20)
(C++23)
Tables
std::inplace_vector
inplace_vector::try_push_back
constexpr pointer try_push_back( const T& value );
(1)
(since C++26)
constexpr pointer try_push_back( T&& value );
(2)
(since C++26)
Conditionally appends the given element value to the end of the container.
If size() == capacity() is true, there are no effects. Otherwise, appends an object of type T:
1) The new element is initialized as a copy of value.
2) value is moved into the new element.
No iterators or references are invalidated, except end(), which is invalidated if the insertion occurs.
[edit] Parameters
value
-
the value of the element to append
Type requirements
-
T must meet the requirements of EmplaceConstructible.
[edit] Return value
std::addressof (back()) if size() < capacity(), nullptr otherwise.
[edit] Complexity
Constant.
[edit] Exceptions
Any exception thrown by initialization of inserted element.
If an exception is thrown for any reason, these functions have no effect (strong exception safety guarantee).
[edit] Notes
This section is incomplete
Reason: Explain the purpose of this API.
Reason: Explain the purpose of this API.
[edit] Example
Run this code
#include <cassert> #include <inplace_vector> #include <string> int main() { std::inplace_vector <std::string, 2> pets; std::string dog{"dog"}; std::string * p1 = pets.try_push_back("cat"); // overload (1) assert (*p1 == "cat" and pets.size() == 1); std::string * p2 = pets.try_push_back(std::move(dog)); // overload (2) assert (*p2 == "dog" and pets.size() == 2); assert (pets[0] == "cat" and pets[1] == "dog"); assert (pets.size() == pets.capacity()); std::string * p3 = pets.try_push_back("bug"); assert (p3 == nullptr and pets.size() == 2); }