warning non void function does not return a value

How to force Mathematica to return `NumericQ` as True when aplied to some variable in Mathematica? Possible NullReferenceException. Pointer to local variable 'X' is stored outside the scope of this variable. Unhandled exceptions in destructor lead to termination of runtime. Variable of the 'string_view' type references a temporary object, which will be removed after evaluation of an expression. V3091. V3105. Abnormality within similar comparisons. If a function sometimes forgets to return a result, you will get a warning (if you have requested warnings). V826. OWASP. V2589. In such a context, we can only call value-returning functions. V2540. The 'alloca' function is used inside the loop. operator are identical. The language standard does not define order in which 'Foo' functions are called during evaluation of arguments. V766. V2613. V711. V3506. Then, enable it by default, but also make it be enabled by Wpedantic and Wreturn-type. Consider assigning value to 'foo' variable instead of declaring it anew. Consider replacing the call to the 'at()' method with the 'operator[]'. Possibly, it was intended to be escaped. Class destructor should not exit with an exception. The '//' and '/*' character sequences should not appear within comments. V3536. V3148. V610. Asking for help, clarification, or responding to other answers. The same sub-expression is present on both sides of the operator. The operator evaluates both operands. Consider inspecting the expression. The 'continue' operator will terminate 'do { } while (FALSE)' loop because the condition is always false. AUTOSAR. Storing credentials inside source code can lead to security issues. V806. V515. Parameter of 'std::stop_token' type is not used inside function's body. V2522. The switch statement does not cover all values of the enum. Only the first element is initialized explicitly. V3084. Explicit conversion from 'void *' to 'int *'. Why does function get compile without RETURN statement Function exited without releasing the pointer/handle. Decreased performance. V1013. It is complaining because within the first for loop, if block returns v but else if block does not return anything. An early return is a return statement that occurs before the last line of a function. V686. Character escape is used in multicharacter literal. Is a return statement mandatory for C++ functions that do not return void? V633. Serialization order of fields should be preserved during deserialization. V587. A pointer without owner is added to the container by the 'emplace_back' method. V2616. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. V687. The 'goto' statement shouldn't jump to a label declared earlier. Such a statement will cause the function to return to the caller when the return statement is executed (before the function would otherwise return to the caller, hence, early). Consider a case where the vector is empty. Significant bits may be lost. MISRA. Effect of a "bad grade" in grad school applications, Using an Ohm Meter to test for bonding of a subpanel. OWASP. Consider refactoring the 'Foo' function. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? Suspicious operation of 'sizeof(X)/sizeof(T)' kind, where 'X' is of the 'class' type. It's possible that 'else' keyword is missing. 55976 - -Werror=return-type should error on returning a value from a V6087. Consider inspecting the correctness of handling the N argument in the 'Foo' function. MISRA. Anonymous function is used to unsubscribe from event. V3061. V1091. the platforms: Continuous use of the analyzer in software development, Deploying the analyzer in cloud Continuous Integration services, Additional configuration and resolving issues. Calling element access method for potentially empty collection may result in exception. V3519. There are two 'if' statements with identical conditional expressions. MISRA. External identifiers should be distinct. Use memsize-type here. An exception should be caught by reference rather than by value. V5618. Consider enabling the display of invisible characters in the code editor. V785. Array indexing should be the only form of pointer arithmetic and it should be applied only to objects defined as an array type. The 'foo' word is suspicious. Use of 'Foo' uninitialized variable. The total size limit is 20MB. The 'A' class containing IDisposable members does not itself implement IDisposable. The variable is never modified. V3165. Cast should not remove 'const' / 'volatile' qualification from the type that is pointed to by a pointer or a reference. The 'Thread' object is created but is not started. A pointer/reference parameter in a function should be declared as pointer/reference to const if the corresponding object was not modified. control reaches end of non-void functions -wreturn-type. Variables are initialized through the call to the same function. Possible realloc() leak: when realloc() fails to allocate memory, original pointer is lost. V3025. nlohmann/json.hpp:20925:5: warning: non-void function does not return a value in all control paths [-Wreturn-type], const_reference operator[](const typename object_t::key_type& key) const Bounds should not contain size of a buffer, but a number of characters it can hold. The comma operator should not be used. Don't use terminating functions in library code. Non-void function is no values returned causes crash #5867 V641. Consider inspecting this expression. If function ends without return (or throw), then the behaviour of the program will be undefined. The resulting value is meaningless and should not be used. V789. V6090. If the function has a void return type, this behavior is okay, but may be considered poor style. rev2023.4.21.43403. V748. V1030. Part of conditional expression is always true/false. WPF: readonly field of 'DependencyProperty' type is not initialized. The 'malloc' function is used to allocate memory for an array of objects that are classes containing constructors/destructors. The 'x' variable is assigned values twice successively. V2526. Consider using of 'if-else' construct. Regression: objToJSON "nonvoid function does not return a value" error is back #31463 Closed pkaleta mentioned this issue on Jun 24, 2020 BUG: NUMPY_IMPORT_ARRAY_RETVAL undeclared when installing pandas 0.18.1 #34969 Closed Sign up for free to join this conversation on GitHub . Update: You need to make your function return a vector in every condition as suggested in comments. Overflow check is incorrect. V5627. Potential logical error is present. V2594. V3159. For example: In the above program, the value to be printed needs to be provided on the right-side of the std::cout <<. The object is returned from inside 'using' block. MISRA. Perhaps the correct expression is strlen(expr) + 1. V5605. Parameter is not utilized inside method's body. V663. Consider specifying execution policy explicitly. V1088. V6004. A memory leak will occur in case of an exception. The expression is incorrect or it can be simplified. Controlling expressions should not be invariant. Member invocation on this value may lead to an exception. Consider assigning realloc() to a temporary pointer. Consider inspecting the 'for' operator. The 'value' parameter is rewritten inside a property setter, and is not used after that. If certain compiler flags are passed, this type of error or warning might get suppressed entirely, which will lead to run-time faults if the given function gets called in the program. Use of two opposite conditions. Consider reviewing the source code that uses the container. Double negation is present in the expression: !!x. V1019. Passing these values into the method will result in an exception. First 'case' operator may be missing. V512. V3045. V1096. V6065. Suspicious return of a local reference variable which always equals null. V1093. V781. All I want the function to do is add one to the value of the each character inputted into the string array and shift it on the ASCII table and then return the coded message. Undefined behavior. V2618. V3008. MISRA. Class initialization cycle is present. Object created using 'new' operator is immediately cast to another type. V3138. It is suspicious that it is used as a variable of a Boolean-type. V1004. Expression is enclosed by parentheses twice: ((expression)). It may happen that flow is never reaching that part of the code but it is important to write for the compiler. Macro name overrides a keyword/reserved name. Potentially unsafe double-checked locking. Consider inspecting the 'for' operator. V6003. The 'strcmp' function returns 0 if corresponding strings are equal. compiler warning: "not return a value" Issue #2917 nlohmann/json Implicit conversion of the type of 'new' operator's argument to size_t type. It is not recommended to throw exceptions from 'Equals(object obj)' method. Object may be created in-place in a container. V2004. The expression is incorrect or can be simplified. AUTOSAR. There should be no attempt to write to a stream that has been opened for reading. Explicit conversion from memsize type to 32-bit integer type. V704. :' operator, regardless of its conditional expression, always returns one and the same value. It is more efficient to catch exception by reference rather than by value. We and our partners use cookies to Store and/or access information on a device. Suspicious explicit conversion from 'float *' type to 'double *' type. Two similar code fragments were found. MISRA. V3081. V3057. This return value is also printed. V2617. V3034. AUTOSAR. V2508. Consider checking the first actual argument of the 'Foo' method. V552. The 'memset/memcpy' function is used to nullify/copy fields of 'Foo' class. Not all IDisposable members are properly disposed. Suspicious declaration. What if I write return statement in constructor? Storing credentials inside source code can lead to security issues. Only the first member of enumerator list should be explicitly initialized, unless all members are explicitly initialized. V5002. V5301. V3123. AUTOSAR. The function with the 'atof/atoi/atol/atoll' name should not be used. It is not advised to declare type 'T' as 32-bit type. V6029. Consider creating a pointer/reference to avoid using the same expression repeatedly. V6097. Looking at the assembly GCC 11.2 generates for this with -O3, we see it has in fact recognized that the union of all cases in the if and else if covers all possibilities: It has generated only two code paths, not three. Function receives suspicious argument. Decreased performance. The values used in expressions should have appropriate essential types. The reason for the error/warning message is because a void function, by definition, does not return a value. Value of 'char' type is added to a string pointer. V3508. . : .' should be used here instead of 'foo = bar = baz ? V581. V1050. V611. Suspicious getter/setter implementation. OWASP. It is possible that ',' comma is missing at the end of the string. operator works in a different way than it was expected. V644. This case may be unreachable. Adding EV Charger (100A) in secondary panel (100A) fed off main (200A). Keyword 'nullptr' can be used for 'pointer' type exception. Two 'if' statements with identical conditional expressions. A Function procedure has at least one possible path through its code that does not return a value. V566. V3055. V1022. An unconditional 'break/continue/return/goto' within a loop. For more information, see "Behavior" in Function Statement. V6034. Do not use real-type variables as loop counters. V2017. ", "? V1062. V3530. Consider checking for misprints. V2573. It is suspicious that the assignment operator takes an object by a non-constant reference and returns this object. V580. Casting expression to 'X' type before implicitly casting it to other type may be excessive or incorrect. It is probably unused, uninitialized, or already locked. Potentially tainted data is written into logs. An excessive type cast or check. rev2023.4.21.43403. Parameter 'A' is always rewritten in method body before being used. Possible excessive expression or typo. Violated order of exception handlers. MISRA. V1077. V3093. The 'zero' value is assigned to pointer. V1017. The value of a composite expression should not be assigned to an object with wider essential type. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, If you are never going to return something, why do you declare the function as doing so? V6089. V765. Pseudo random sequence is the same at every program run. Then main returns a value of 0 (typically used to report success) to end the program. The '? An odd sequence of assignments of this kind: A = B; B = A; V3038. MISRA. Potentially tainted data is used in a search filter. Memory is allocated and released multiple times inside the loop body. Possible dereference of invalid iterator 'X'. V816. The functions from time.h/ctime should not be used. It is possible that a typo is present inside the string literal. Try to avoid many return statements in your code. V636. V2591. It is more effective to use the prefix form of ++it. V1079. V1015. For more information, see Return type. This condition was already verified in previous line. Suspicious type conversion: HRESULT -> BOOL (BOOL -> HRESULT). Thus, the warning is a very useful one and you should consider yourself lucky that the compiler noticed the bug. The 'static' storage class specifier should be used in all declarations of object and functions that have internal linkage. The right operand is greater than or equal to the number of bits in the left operand. Identifiers that start with '__' or '_[A-Z]' are reserved. V1063. V6085. MISRA. Three potential reasons for issue the warning (elevated to an error) in spite of this come to mind: Nonetheless, this is easy to work around. Unsafe double-checked locking. Buffer size is not a multiple of element size. V6027. V2012. The loop will not be executed. Automatic unboxing of a variable may cause NullPointerException. V542. V1034. Potential division by zero. MISRA. The variable in the loop exit condition does not change its value between iterations. V649. V5612. Do not concatenate string literals with different prefixes.

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