解决编译warning:warning: ‘MeteringUnit::voltage_gain_’ will be initialized after [-Wreorder]

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问题:

环境:ubuntu 12.04,g++版本4.6.3,编译目标文件时出现warnings:

u1204@u1204-zhw:~/hwsvn/2sw/4prj_mips/UCP_rt5350/src/trunk$ make clean;makerm -f *.o local_ctrlg++ -g3 -Wall -o0 -c msgrcv_cmd.cpp -o msgrcv_cmd.oIn file included from msgrcv_cmd.h:24:0,                 from msgrcv_cmd.cpp:30:controller.h: In constructor ‘MeteringUnit::MeteringUnit(size_t, double, double, double)’:controller.h:92:12: warning: ‘MeteringUnit::voltage_gain_’ will be initialized after [-Wreorder]controller.h:91:12: warning:   ‘double MeteringUnit::current_gain_’ [-Wreorder]controller.h:77:5: warning:   when initialized here [-Wreorder]g++ -g3 -Wall -o0 -c controller.cpp -o controller.oIn file included from controller.cpp:21:0:controller.h: In constructor ‘MeteringUnit::MeteringUnit(size_t, double, double, double)’:controller.h:92:12: warning: ‘MeteringUnit::voltage_gain_’ will be initialized after [-Wreorder]controller.h:91:12: warning:   ‘double MeteringUnit::current_gain_’ [-Wreorder]controller.h:77:5: warning:   when initialized here [-Wreorder]g++ -g3 -Wall -o0 -c thread.cpp -o thread.og++ -g3 -Wall -o0 -c ini_file.cpp -o ini_file.og++ -g3 -Wall -o0 -c main_ctrl.cpp -o main_ctrl.oIn file included from main_ctrl.cpp:25:0:controller.h: In constructor ‘MeteringUnit::MeteringUnit(size_t, double, double, double)’:controller.h:92:12: warning: ‘MeteringUnit::voltage_gain_’ will be initialized after [-Wreorder]controller.h:91:12: warning:   ‘double MeteringUnit::current_gain_’ [-Wreorder]controller.h:77:5: warning:   when initialized here [-Wreorder]

解决办法:

1. 出问题的地方在头文件controller.h中,

class MeteringUnit {public:    MeteringUnit(size_t port_num = 1, double pgain = 1.0, double cgain = 1.0, double vgain = 1.0)    : port_(port_num), power_gain_(pgain), voltage_gain_(vgain), current_gain_(cgain) { }    ~MeteringUnit();    void Refresh();    double Power() const;    double Current() const;    double Voltage() const;private:    size_t port_;    operation* mu_op_;    static const SensorType sensor_typ_ = EMETER;private:    static const int emeter_pulse_const_ = 3200;    double power_gain_;    double current_gain_;    double voltage_gain_;    double power_;    double current_;    double voltage_;int gpqs1_;// GP1/GQ1/GS1(0x50/0x51/0x52)int gphs1_;// Gphs1(0x6d)int p1offset_;// P1offset(0x65)};
从编译后的提示,已经可以很明白地看出错在什么地方了,
MeteringUnit::voltage_gain_应该在double MeteringUnit::current_gain_之后初始化。

也就是说,构造函数中变量初始化的顺序与该成员变量在类MeteringUnit中定义的顺序不一致。

将其中的两行

    MeteringUnit(size_t port_num = 1, double pgain = 1.0, double cgain = 1.0, double vgain = 1.0)    : port_(port_num), power_gain_(pgain), voltage_gain_(vgain), current_gain_(cgain) { }
改为
    MeteringUnit(size_t port_num = 1, double pgain = 1.0, double cgain = 1.0, double vgain = 1.0)    : port_(port_num), power_gain_(pgain), current_gain_(cgain), voltage_gain_(vgain) { }
重新编译,问题解决。

u1204@u1204-zhw:~/hwsvn/2sw/4prj_mips/UCP_rt5350/src/trunk$ make clean;makerm -f *.o local_ctrlg++ -g3 -Wall -o0 -c msgrcv_cmd.cpp -o msgrcv_cmd.og++ -g3 -Wall -o0 -c controller.cpp -o controller.og++ -g3 -Wall -o0 -c thread.cpp -o thread.og++ -g3 -Wall -o0 -c ini_file.cpp -o ini_file.og++ -g3 -Wall -o0 -c main_ctrl.cpp -o main_ctrl.og++ -o local_ctrl msgrcv_cmd.o controller.o thread.o ini_file.o main_ctrl.o -L../../drivers -lphysicalop -lpthread



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