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Throwing an exception copy-initializes a temporary object, called the exception object. The temporary is an lvalue and is used to initialize the variable declared in the matching handler.

If the copy constructor for the exception object type throws during the copy initialization, std::terminate() is called, which can result in undefined possibly unexpected implementation-defined behavior. For more information on implicitly calling std::terminate(), see ERR50-CPP. Do not abruptly terminate the program.

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In this noncompliant code example, an exception of type S is thrown from in f(). However, because S has a std::string data member, and the copy constructor for std::string is not declared noexcept, the implicitly-defined copy constructor for S is also not declared to be noexcept. In low-memory situations, the copy constructor for std::string may be unable to allocate sufficient memory to complete the copy operation, resulting in a std::bad_alloc exception being thrown.

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Allowing the application to abnormally terminate can lead to resources not being freed, closed, and so on. It is frequently a vector for denial-of-service attacks.

Rule	Severity	Likelihood	Remediation Cost	Priority	Level
ERR60-CPP	Low	Probable	Medium	P4	L3

Automated Detection

Tool

Version

Checker

Description

Clang

Include Page

	Clang_38_V
	Clang_38_V

cert-err60-cpp

Checked by clang-tidy

PRQA QA-

Helix QAC

Include Page

	Helix QAC_V
	Helix QAC_V

C++

Include Page

3508
Parasoft C/

PRQA QA-

C++

_VPRQA QA-C++_V

3508

test

Include Page

	Parasoft_V
	Parasoft_V

CERT_CPP-ERR60-a
CERT_CPP-ERR60-b

Exception objects must be nothrow copy constructible
An explicitly declared copy constructor for a class that inherits from 'std::exception' should have a non-throwing exception specification

Polyspace Bug Finder

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