xieite::tmp()

Defined in header <xieite/fn/tmp.hpp>

Creates a temporary object which lives for the duration of the full expression which contains it.
Can be used for ignoring output parameters (see example).
Does not heap-allocate, unlike std::make_unique<T>(args...).get().


Declaration

 
template<typename T>
[[nodiscard]] constexpr T& tmp(T&& x = {}) noexcept;


Example

 
void bad_api(int a, int b, int* out) {
	int sum = a + b;
	*out = sum; // Does not handle nullptr
	xieite::dump(sum);
}

int main() {
	// Don't care about output parameter
	bad_api(1, 2, &xieite::tmp<int>());
}
Output: 
3
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