警告信息 "[warning] reference to local variable 'a' returned [-wreturn-local-addr]" 表示你的函数试图返回一个局部变量的引用。在C++中,局部变量在函数执行完毕后会被销毁,因此返回局部变量的引用会导致未定义行为,因为返回的引用指向的内存可能已经不再有效。
Declaration statements introduce a new local variable, local constant, or local reference variable (ref local). Local variables can be explicitly or implicitly typed. A declaration statement can also include initialization of a variable's value.
Declaration statements introduce a new local variable, local constant, or local reference variable (ref local). Local variables can be explicitly or implicitly typed. A declaration statement can also include initialization of a variable's value.
Declaration statements introduce a new local variable, local constant, or local reference variable (ref local). Local variables can be explicitly or implicitly typed. A declaration statement can also include initialization of a variable's value.
/** * Returns the value in the current thread's copy of this * thread-local variable. If the variable has no value for the * current thread, it is first initialized to the value returned * by an invocation of the {@link #initialValue} method. * * @return the current thread's value...
If the value is unknown by this agent, then the value 'unknown(2)' is returned. This object is used only as the VB bound variable of the alarm. 1.3.6.1.2.1.47.1.1.1.1.6 entPhysicalParentRelPos Integer32{(-1,2147483647)} read-only An indication of the relative position of this...
In case when the user buffer was too small to copy the value, the call fails and needed buffer size is returned by 'out_length_of_val'. Typical use (char * variable): char *value, buffer_for_value[160]; size_t value_length; value= &buffer_for_value[0]; value_length= sizeof...
Directory Server is not properly configured to access data in a backend. Provide more local disk space to Directory Server, if necessary. Check that nsslapd-backend is correctly set in the appropriate mapping tree entry under cn=config. Check that the backend state is set correctly. Check...
DeclareTheDeclareoperator allocates a local variable in the query plan. Declareis a language element. DeleteTheDeleteoperator deletes rows (from an object) that satisfy the optional predicate in thePropertiespane. Deleted ScanIn triggers, theDeleted Scanoperator scans thedeletedtable. ...
If the key files are not located in the data directory, or to make their locations explicit in the system variable values, use full path names: [mysqld]caching_sha2_password_private_key_path=/usr/local/mysql/myprivkey.pemcaching_sha2_password_public_key_path=/usr/local/mysql/mypubkey.pem...