noexcept Specifier

1// noexcept - function won't throw
2void safeFunction() noexcept {
3    // If exception escapes, terminate() is called
4}
5
6// Conditional noexcept
7template<typename T>
8void swap(T& a, T& b) noexcept(noexcept(T(move(a)))) {
9    T temp = move(a);
10    a = move(b);
11    b = move(temp);
12}
13
14// noexcept operator - check if expression can throw
15static_assert(noexcept(1 + 1));  // true
16static_assert(!noexcept(throw 1)); // true
17
18// Move constructor should be noexcept
19class Resource {
20public:
21    Resource(Resource&& other) noexcept
22        : data(other.data) {
23        other.data = nullptr;
24    }
25};
26
27// STL containers use noexcept to decide
28// whether to move or copy during reallocation
29// vector will only move if move ctor is noexcept
30
31// Destructor is implicitly noexcept
32~MyClass() {  // noexcept by default
33    // Don't throw from destructors!
34}