warning non void function does not return a value

V563. The other reason is that void more clearly conveys that the function is supposed to not return a value, rather than return null specifically. Identifiers that start with '__' or '_[A-Z]' are reserved. Possible incorrect order of arguments passed to method. V543. Calling method or accessing property of potentially disposed object may result in exception. Exception classes should be publicly accessible. It's possible that the line was commented out improperly, thus altering the program's operation logics. Consider using a comparison with defined precision: Math.Abs(A - B) < Epsilon or Math.Abs(A - B) > Epsilon. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. V3003. Suspicious assignment inside the conditional expression of 'if/while/dowhile' statement. The expression is excessive or contains a logical error. V3131. AUTOSAR. V5608. Memory is allocated and released multiple times inside the loop body. Operands of the logical '&&' or the '||' operators, the '!' V647. All analyzer messages were filtered out or marked as false positive. V704. OWASP. The 'static' storage class specifier should be used in all declarations of functions that have internal linkage. V765. For more information, see Return type. MISRA. The 'X' counter is not used inside a nested loop. V3032. Possible exception when deserializing type. Size of array calculated by sizeof() operator was added to a pointer. Value of variable is checked after use. Potential insecure deserialization vulnerability. MISRA. V757. The expression contains a suspicious mix of integer and real types. Suspicious division. There should be no attempt to write to a stream that has been opened for reading. V6040. Decreased performance. Potentially tainted data might be used to execute a malicious script. The left operand of integer division is less than the right one. OWASP. By cv void, it simply means a function with void return type, that may be const or volatile. Consider inspecting the expression. Such a pointer will become invalid. Historically, early returns were frowned upon. What is scrcpy OTG mode and how does it work? Any label should be declared in the same block as 'goto' statement or in any block enclosing it. The initial value of the index in the nested loop equals 'i'. MISRA. An odd sequence of assignments of this kind: A = B; B = A; V3038. Consider utilizing an explicit type cast to avoid the loss of a fractional part. Literal suffixes should not contain lowercase characters. V688. V3035. Consider inspecting the application's logic. Function body contains the 'X' label that is not used by any 'goto' statements. Parameter is not used inside method's body. Defining an absolute path to the file or directory is considered a poor style. It is more efficient to use an initialization list rather than an assignment operator. Consider allocating it on the stack instead. V806. The assignment operator should be protected from the case of 'this == &src'. V728. Sorting keys priority will be reversed relative to the order of 'OrderBy' method calls. What risks are you taking when "signing in with Google"? V2517. V1007. V600. V813. Inspect the program's logic. V3122. The 'then' statement is equivalent to the 'else' statement. Postfix increment/decrement is senseless because this variable is overwritten. Possible ReDoS vulnerability. Which language's style guidelines should be used when writing code that is supposed to be called from another language? Use of a pointer to FILE when the associated stream has already been closed. C-style explicit type casting is utilized. Possible Zip Slip vulnerability. Reference was invalidated because of destruction of the temporary object returned by the function. V3125. V3067. V6021. V5007. InvalidClassException may occur during deserialization. V2014. MISRA. An identifier declared in an inner scope should not hide an identifier in an outer scope. V652. V3156. V521. MISRA. What "benchmarks" means in "what are benchmarks for?". V3139. Consider using a comparison with defined precision: Math.abs(A - B) < Epsilon or Math.abs(A - B) > Epsilon. Parameter of 'CancellationToken' type is not used inside function's body. Why are players required to record the moves in World Championship Classical games? Then, enable it by default, but also make it be enabled by Wpedantic and Wreturn-type. OWASP. The compiler has been asked to treat warnings as errors. V666. Consider inspecting the NNth argument of the 'Foo' function. Function result is saved inside the 'byte' type variable. In the above example, when print() executes, it will first print A. V620. ConcurrentModificationException may occur. An odd precise comparison. Potentially tainted data is used in the URL. Your message has been sent. V2558. Expressions that use comma operator ',' are dangerous. 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. V508. Value of the expression should not be converted to the different essential type or the narrower essential type. AUTOSAR. V625. The hyperbolic space is a conformally compact Einstein manifold. V1029. for example: void throw_blah () { throw "blah"; } int foo () { throw_blah (); } I am pretty curious about this as this is directly related to one of my other issue . V1014. V2548. Suspicious operation of 'sizeof(X)/sizeof(T)' kind, where 'X' is of the 'class' type. Use 'double.IsNaN()' method instead. The result of '&' operator is '0' because one of the operands is '0'. MISRA. No locking will be performed. Hi, been using 2.0.1 so far over the proposed workaround (void function instead of non-void function). V3539. V785. Consider inspecting the loop expression. V3076. V6029. AUTOSAR. Subtraction, >, >=, <, <= should be applied only to pointers that address elements of the same array. V833. Consider using '||' and '&&' instead. What is scrcpy OTG mode and how does it work? The class implements a copy constructor/operator=, but lacks the operator=/copy constructor. Consider adding '[Flags]' attribute to the enum. C++ code showing Line 25: Char 5: error: non-void function does not return a value in all control paths [-Werror,-Wreturn-type], How a top-ranked engineering school reimagined CS curriculum (Ep. Presence of #line directives may cause some diagnostic messages to have incorrect file name and line number. V6011. Implicit assignment type conversion to memsize type. V1074. V650. The result of an assignment expression should not be used. It is possible that 'else' block was forgotten or commented out, thus altering the program's operation logics. however, it floods the compiler output. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. OWASP. It is easier to guarantee that every return from the procedure returns a value if you always use the Return statement. Consider replacing standard container with a different one. Odd semicolon ';' after 'if/for/while' operator. Execution resumes in the calling function at the point immediately following the call. V101. Unlike this recommendation, that rule is restricted to functions from the Standard C library. AUTOSAR. The variable of char type is compared with pointer to string. Implicit type conversion N argument of function 'foo' to memsize type. You are assuming that loop will always run, but, what if an empty string ends up getting submitted? Every switch-clause should be terminated by an unconditional 'break' or 'throw' statement. Let's consider an example: V661. V3094. Implicit type conversion of return value from memsize type to 32-bit type. Inspect the following programs and state what they output, or whether they will not compile. The '&=' operation always sets a value of 'Foo' variable to zero. The first call to printHi() is called in a context that does not require a value. MISRA. V580. The 'malloc' function is used to allocate memory for an array of objects that are classes containing constructors/destructors. V2599. Value of the essential character type should be used appropriately in the addition/subtraction operations. V2509. Functions are not required to return a value back to the caller. The 'SuspendThread' function is usually used when developing a debugger. Are you missing a 'Return' statement? V3542. V782. Parameter is always rewritten in function body before being used. Perhaps, 'ThenBy' should be used instead. Unhandled exceptions in destructor lead to termination of runtime. Possible incorrect initialization of variable. V514. Terminal null is present inside a string. Type casting is used 2 times in a row. V588. AUTOSAR. V542. V631. CS50 Stack Exchange is a question and answer site for students of Harvard University's CS50. The 'value' parameter is rewritten inside a property setter, and is not used after that. Check for typos and consider using the 'default:' operator instead. Functions should be declared in prototype form with named parameters. V3554. If a function returns no meaningful value, it should be declared with return type void. nlohmann/json.hpp:20017:5: warning: non-void function does not return a value in all control paths [-Wreturn-type] reference operator[](T* key) nlohmann/json.hpp:20925:5: warning: non-void function does not return a value in all control paths [-Wreturn-type] During the initial analysis, the code nominally contains three code paths. V541. Functions should not have unused parameters. It's possible that an assigned variable should be checked in the next condition. Compound assignment expression is used inside condition. Potentially negative value is used as the size of an array. OWASP. MISRA. V651. Did the Golden Gate Bridge 'flatten' under the weight of 300,000 people in 1987? V111. V3548. V3520. V755. V2563. An empty container is iterated. To learn more, see our tips on writing great answers. It is possible that these are misprints and 'default:' label should be used instead. V1017. MISRA. V811. Implicit type conversion from enum type to integer type. How do I stop the Flickering on Mode 13h? NullReferenceException is possible. Possible typo in the spelling of a pre-defined macro name. Potentially unsafe double-checked locking. Find centralized, trusted content and collaborate around the technologies you use most. MISRA. V6072. MISRA. Overflow check is incorrect. Currently your code is returning the vector based on conditions. nlohmann/json.hpp:20877:5: warning: non-void function does not return a value in all control paths [-Wreturn-type]. Perhaps this is a mistake. Consider inspecting the expression. The function was annotated as dangerous. The sizeof() operator is multiplied by sizeof(). Possible use of left shift operator instead of comparison operator. Adding EV Charger (100A) in secondary panel (100A) fed off main (200A). The 'static' storage class specifier should be used in all declarations of object and functions that have internal linkage. V5304. We and our partners use cookies to Store and/or access information on a device. Here is my code: why does it show compile error?? The 'throw' keyword could be missing. Comparison with 'double.NaN' is meaningless. Consider using an explicit type cast to avoid overflow or loss of a fractional part. V3039. V808. V206. So GCC knows there is no possible control path that does not return a value, but it reported the warning (elevated to an error) anyway. MISRA. The 'foo' local variable has the same name as one of class members. V1054. V742. V506. Classes should always be derived from std::exception (and alike) as 'public'. The return value of non-void function should be used. V6078. Probably meant: *ptr != zero. Unsafe double-checked locking. An unconditional 'break/continue/return/goto' within a loop. V584. V1023. V3551. Perhaps the correct expression is strlen(expr) + 1. Extracting arguments from a list of function calls. The 'if' 'else if' construct should be terminated with an 'else' statement. Calling overrideable class member from constructor is dangerous. V1057. Macro expression is dangerous or suspicious. ", "!"? V3521. V643. Different containers are used to set up initial and final values of iterator. An exception should be caught by reference rather than by value. Consider assigning event to a local variable before invoking it. Decreased performance. To compile the example, create a source code file named C_return_statement.c. V725. V2511. V1008. Methods returning a value: My statement was question specific. V758. If no return expression is supplied, the Microsoft C runtime returns a value that indicates success (0) or failure (a non-zero value). The 'goto' statement should not be used. V632. Upper bound of case range is less than its lower bound. AUTOSAR. Consider inspecting the 'for' operator. We know it knows for two reasons. Consider using of 'if-else' construct. A function name may be missing. Expression 'A = B == C' is calculated as 'A = (B == C)'. Allocation of memory by the pattern "(X*)malloc(sizeof(Y))" where the sizes of X and Y types are not equal. V5010. The assignment to a member of the readonly field will have no effect when the field is of a value type. OWASP. Unexpected uint64 behaviour 0xFFFF'FFFF'FFFF'FFFF - 1 = 0? A return statement ends the execution of a function, and returns control to the calling function. V780. The size of the dynamic array can be less than the number of elements in the initializer. V5607. The expression of strlen(MyStr.c_str()) kind can be rewritten as MyStr.length(). Therefore, printHi is given a void return type. Consider inspecting the expression. V749. It is suspicious and can possibly be an error. For example, running this piece of code is working fine: While, on the other hand, if we try to use/call some function to complete the throw, it is facing the well known error/warning of: I am pretty curious about this as this is directly related to one of my other issue, where just like here, throw is working fine but using macro for throw is facing the same error. V3171. The argument should probably be rendered as a constant pointer/reference. Nonsensical comparison of two different functions' addresses. std::cout doesnt know how to handle this (what value would it output?). V2598. An unconditional 'break/continue/return/goto' within a loop. Passing these values into the method will result in an exception. Both operands of an operator should be of the same type category. Asking for help, clarification, or responding to other answers. It is possible that a wrong variable is compared inside the 'for' operator. Flowing off the end of thesefunctions is equivalent to a'return 0;'. It's possible that the line was commented out improperly, thus altering the program's operation logics. 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). V2506. V673. It is possible that a call to 'Start' method is missing. Manage Settings V6099. V2600. MISRA. V3010. The double result is stored in fraction, then printed. Function marked as 'noreturn' may return control. Suspicious access to element by a constant index inside a loop. It is possible that an error is present. New variable with default value is created instead of 'std::unique_lock' that locks on the mutex. V2619. V597. V576. V2524. Checking value for null will always return false when generic type is instantiated with a value type. A minor scale definition: am I missing something? A function should not call itself either directly or indirectly. Email? MISRA. Thanks for contributing an answer to Stack Overflow! V6037. Dangerous cast of 'this' to 'void*' type in the 'Base' class, as it is followed by a subsequent cast to 'Class' type. Void functions are created and used just like value-returning functions except they do not return a value after the function executes. Consider inspecting this expression. Subtraction, >, >=, <, <= should be applied only to pointers that address elements of the same array. V2539. Stack of original exception could be lost. V3011. V713. The result will always be zero. V6069. V1075. Consider declaring it as a reference. V6101. . The value is assigned to the 'x' variable but is not used. The variable is incremented in the loop. V664. V6058. Collection is modified while iteration is in progress.

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