struct nothrow_t {};
(until C++11)struct nothrow_t { explicit nothrow_t() = default; };
(since C++11) (2)std::nothrow_t is an empty class type used to disambiguate the overloads of throwing and non-throwing allocation functions. std::nothrow is a constant of it.
#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] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR Applied to Behavior as published Correct behavior LWG 2510 C++11 the default constructor was non-explicit, which could lead to ambiguity made explicit [edit] See alsoRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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