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noexcept operator (since C++11)

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Revision as of 07:13, 3 January 2014 by Cubbi (Talk | contribs)

The noexcept operator performs a compile-time check that returns true if an expression is declared to not throw any exceptions.

It can be used within a function template's noexcept specifier to declare that the function will throw exceptions for some types but not others.

Contents

Syntax

noexcept( expression )

Returns an object of type bool.

Explanation

The noexcept operator does not evaluate expression. The result is false if the expression contains at least one of the following potentially evaluated constructs:

In all other cases the result is true.

Keywords

noexcept

Example

template <class T>
void self_assign(T& t) noexcept(noexcept(t = t))
{ // self_assign is noexcept if and only if T::operator= is noexcept
    t = t;
}


See also

noexcept specifier requires a function to not throw any exceptions (C++11) [edit]
exception specification specifies what exceptions are thrown by a function (deprecated) [edit]