ISO C++禁止声明没有自动迭代器类型的“it”

ISO C++ forbids declaration of ‘it’ with no type for auto iterator?

本文关键字:类型 迭代器 it 禁止 C++ 声明 ISO      更新时间:2023-10-16

我有这六行:

    auto it = rcp_amxinfo.find(LocalPass.script);//175
    if (it != rcp_amxinfo.end()) //176
    {//177
        if(it->second.GPSRouteCalculated.PublicFound)//178
        {
            ...
            amx_Exec(LocalPass.script, NULL, it->second.GPSRouteCalculated.POINTER);//186

它们在 VS2012 中编译得很好,但在 centOS6 上的 GCC 中,我收到以下错误:

./RouteConnector/main.cpp:175: error: ISO C++ forbids declaration of ‘it’ with no type
./RouteConnector/main.cpp:175: error: cannot convert ‘std::_Rb_tree_iterator<std::pair<AMX* const, Callbacks> >’ to ‘int’ in initialization
./RouteConnector/main.cpp:176: error: no match for ‘operator!=’ in ‘it != rcp_amxinfo.std::map<_Key, _Tp, _Compare, _Alloc>::end [with _Key = AMX*, _Tp = Callbacks, _Compare = std::less<AMX*>, _Alloc = std::allocator<std::pair<AMX* const, Callbacks> >]()’
./RouteConnector/main.cpp:178: error: base operand of ‘->’ is not a pointer
./RouteConnector/main.cpp:186: error: base operand of ‘->’ is not a pointer

rcp_amxinfo定义如下:

struct CallbackAMX
{
    bool PublicFound;
    int POINTER;
    CallbackAMX()
    {
        PublicFound = false;
        POINTER = 0;
    }
};
struct Callbacks
{
    CallbackAMX ClosestNodeIDChange;
    CallbackAMX GPSRouteCalculated;
};
std::map            <AMX*, Callbacks>               rcp_amxinfo;

如何在 Linux 上解决这些错误?

构建时启用 C++11 模式。为此,您可以在编译器标志中添加-std=gnu++11(获取默认情况下打开的 GCC 扩展)或-std=c++11(仅适用于 ISO C++)。

auto在 C++11(推断类型)中的含义与在以前的标准(指定自动存储类)中的含义不同。