大约有 118 项符合查询结果（耗时：0.0396秒） [XML]
What is std::move(), and when should it be used?
...casting to a rvalue reference.
Simplisticly std::move(t) is equivalent to:
static_cast<T&&>(t);
An rvalue is a temporary that does not persist beyond the expression that defines it, such as an intermediate function result which is never stored in a variable.
int a = 3; // 3 is a rvalu...
Why does an overridden function in the derived class hide other overloads of the base class?
...he base interface. So maybe d->foo() won't get you the "Is-a Base", but static_cast<Base*>(d)->foo() will, including dynamic dispatch.
– Kerrek SB
Jan 9 '14 at 13:36
12...
Difference between std::system_clock and std::steady_clock?
...
QueryPerformanceCounter(&counter);
return time_point(duration(static_cast<rep>((double)counter.QuadPart / frequency.QuadPart *
period::den / period::num)));
}
private:
static bool is_inited; ...
How much faster is C++ than C#?
... for (auto c = 0; c < COLS; ++c)
{
arr[i++] = static_cast<double>(r * c);
}
}
auto fillFinish = std::chrono::steady_clock::now();
auto fillTime = std::chrono::duration_cast<std::chrono::milliseconds>(fillFinish - fillStart);
return s...
Why doesn't c++ have &&= or ||= for booleans?
... performs integer promotion such that the expression is then equivalent to static_cast<int>(b) & 2, which results in 0, which is then converted back into a bool. So it’s true that the existence of an operator &&= would improve type safety.
...
Is a `=default` move constructor equivalent to a member-wise move constructor?
...ber m has rvalue reference type T&&, it is direct-initialized with static_cast(x.m);
otherwise, the base or member is direct-initialized with the corresponding base or member of x.
Virtual base class subobjects shall be initialized only once by the
implicitly-defined copy/move co...
Timer function to provide time in nano seconds using C++
...latile("rdtsc" : "=a" (lo), "=d" (hi));
return time_point(duration(static_cast<rep>(hi) << 32 | lo));
}
};
} // x
All this clock does is count CPU cycles and store it in an unsigned 64-bit integer. You may need to tweak the assembly language syntax for your compiler. Or...
When to use std::forward to forward arguments?
... os;
}
std::string to_string (void) const {
auto address = static_cast<const void*>(this);
std::stringstream ss;
ss << address;
return "BankAccount(" + ss.str() + ", cash $" + std::to_string(cash) + ")";
}
};
template<typename T, typename A...
C++ unordered_map using a custom class type as the key
...mTypeHash {
std::size_t operator()(const T& type) const {
return static_cast<std::size_t>(type);
}
};
enum MyEnum {};
class MyValue {};
std::unordered_map<MyEnum, MyValue, EnumTypeHash<MyEnum>> map_;
...
How to find the kth smallest element in the union of two sorted arrays?
...mp;& issorted(firstb, lastb, less));
for ( ; ; ) {
assert(n < static_cast<size_t>((lasta - firsta) + (lastb - firstb)));
if (firsta == lasta) return *(firstb + n);
if (firstb == lastb) return *(firsta + n);
size_t mida = (lasta - firsta) / 2;
size_t midb = (lastb ...