std::inplace_vector<T,N>::try_push_back
From cppreference.com
< cpp | container | inplace vector
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constexpr pointer try_push_back( const T& value );
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(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.
Parameters
| value | - | the value of the element to append |
| Type requirements | ||
-
T must meet the requirements of EmplaceConstructible
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Return value
std::addressof (back( ) ) if size() < capacity(), nullptr
Complexity
Constant.
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).
Notes
| This section is incomplete Reason: Explain the purpose of this API. |
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); }
See also
| adds an element to the end (public member function) |
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| constructs an element in-place at the end (public member function) |
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| adds a range of elements to the end (public member function) |
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| tries to construct an element in-place at the end (public member function) |
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| tries to add a range of elements to the end (public member function) |
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| unconditionally constructs an element in-place at the end (public member function) |
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| unconditionally adds an element to the end (public member function) |
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| removes the last element (public member function) |
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| creates a std::back_insert_iterator of type inferred from the argument (function template) |