C/C ++警告:BDADDR_ANY蓝牙库的临时地址 [英] C/C++ Warning: address of temporary with BDADDR_ANY Bluetooth library

问题描述

我在使用Ubuntu下的Bluetooth库的g ++和C/C ++程序的编译过程中遇到了一些问题.

I'm having some problems with g++ and the compiling process for a C/C++ program which use Bluetooth libraries under Ubuntu.

如果我使用gcc，它可以正常工作而不会发出警告；相反，如果我使用g ++，则会收到以下警告:

If i use gcc, it works fine with no warning; on the contrary, if i use g++ i get this warning:

警告:以临时地址为地址

warning: taking address of temporary

即使该程序可以正常运行并且可以正常工作.

even if the program compiles fine and it works.

报告错误的相关行是:

        bdaddr_t *inquiry(){
       // do some stuff.. 
    bacpy(&result[mote++], BDADDR_ANY);
    return result;
}
//...
void zeemote(){
while (bacmp(bdaddr, BDADDR_ANY)){
/..
}
}

在两种情况下，都涉及BDADDR_ANY.

In both the cases, BDADDR_ANY is involved.

我该如何解决此警告?

BDADDR_ANY是在bluetooth.h中定义的，例如:

BDADDR_ANY is defined in bluetooth.h like:

/* BD Address */
typedef struct {
    uint8_t b[6];
} __attribute__((packed)) bdaddr_t;

#define BDADDR_ANY   (&(bdaddr_t) {{0, 0, 0, 0, 0, 0}})

推荐答案

(&(bdaddr_t) {{0, 0, 0, 0, 0, 0}})

构造一个临时对象并使用其地址.在C ++中是不允许的.

Constructs a temporary object and uses its address. This isn't allowed in C++.

您可以通过创建命名的临时变量并在其上使用bacpy和bacmp来解决此问题:

You can fix this by creating a named temporary variable and using bacpy and bacmp on it:

bdaddr_t tmp = { };

bacpy(&result[mote++], &tmp);

和

while (bacmp(bdaddr, &tmp)) {
    //
}

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