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Do not write a syntactically ambiguous declaration. With the advent of uniform initialization syntax using a braceda braced-init-list, there is now syntax that unambiguously specifies a declaration instead of an expression statement. Declarations can also be disambiguated by using nonfunction-style casts, by initializating initializing using =, or by removing extraneous parenthesis around the parameter name.

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Code Block

language	cpp

Widget constructed
 Gadget constructed
Widget constructed 
Gadget constructed
3

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Syntactically ambiguous declarations can lead to unexpected program execution. However, it is likely that rudimentary testing would uncover violations of this rule.

Rule	Severity	Likelihood	Detectable

Remediation Cost

Repairable	Priority	Level
DCL53-CPP	Low	Unlikely

Medium

Yes

No

P2

L3

Automated Detection

PRQA QA-

Tool

Version

Checker

Description

CodeSonar

Include Page

	CodeSonar_V
	CodeSonar_V

LANG.STRUCT.DECL.FNEST

Nested Function Declaration

Helix QAC

Include Page

	Helix QAC_V
	Helix QAC_V

C++1109, C++2510

Klocwork

Include Page

	Klocwork_V
	Klocwork_V

CERT.DCL.AMBIGUOUS_DECL

LDRA tool suite

Include Page

	LDRA_V
	LDRA_V

296 S

Partially implemented

Parasoft C/C++test

Include Page

PRQA QA-C++_VPRQA QA-C++_V

2510

	Parasoft_V
	Parasoft_V

CERT_CPP-DCL53-a
CERT_CPP-DCL53-b
CERT_CPP-DCL53-c

Parameter names in function declarations should not be enclosed in parentheses
Local variable names in variable declarations should not be enclosed in parentheses
Avoid function declarations that are syntactically ambiguous

Polyspace Bug Finder

Include Page