noexcept operator (since C++11)

 

C++

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Technical Specifications

 

C++ language

 

Exceptions

throw-expression

function-try-block

try/catch block

noexcept specifier(C++11)

noexcept operator(C++11)

Dynamic exception specification(deprecated)

 

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.

Syntax

noexcept( expression )

Returns a prvalue 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: call to any type of function that does not have non-throwing exception specification, unless it is a constant expression. throw expression. dynamic_cast expression when the target type is a reference type, and conversion needs a run time check typeid expression when argument type is polymorphic class type In all other cases the result is true.

(until C++17)

The result is true if the set of potential exceptions of the expression is empty, and false otherwise.

(since C++17)

Keywords

noexcept