std::nothrow
From cppreference.com
| Defined in header
<new>
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| extern const std::nothrow_t nothrow;
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std::nothrow is a constant of type std::nothrow_t used to disambiguate the overloads of throwing and non-throwing allocation functions.
[edit] Example
Run this code
#include <iostream> #include <new> int main() { try { while (true) { new int[100000000ul]; // throwing overload } } catch (const std::bad_alloc& e) { std::cout << e.what() << '\n'; } while (true) { int* p = new(std::nothrow) int[100000000ul]; // non-throwing overload if (p == nullptr) { std::cout << "Allocation returned nullptr\n"; break; } } }
Output:
std::bad_alloc Allocation returned nullptr
[edit] See also
| tag type used to select an non-throwing allocation function (class) |
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| allocation functions (function) |