使用“auto”会产生错误 C4430:缺少类型说明符 - 假定为 int。注意:C++ 不支持 default-int
Using `auto` yields error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
我在 Windows 10 上使用 VS2008。
我对这个功能有疑问,希望你能帮助我
void CPythonNetworkStream::AppearShopSign(DWORD dwVID, std::string stSign) {
if (stSign.empty())
for (auto it = m_mapShopSign.begin(); it != m_mapShopSign.end(); ++it)
if (dwVID == it->first)
stSign = it->second;
// LogBoxf("AppearShopSign: %u-%s", dwVID, stSign.c_str());
PyCallClassMemberFunc(m_apoPhaseWnd[PHASE_WINDOW_GAME], "BINARY_PrivateShop_Appear", Py_BuildValue("(is)", dwVID, stSign.c_str()));
}
错误信息
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
error C2440: 'initializing' : cannot convert from 'std::_Tree<_Traits>::iterator' to 'int'
error C2678: binary '!=' : no operator found which takes a left-hand operand of type 'int' (or there is no acceptable conversion)
error C2227: left of '->first' must point to class/struct/union/generic type
自从 c++11 标准以来支持 auto
关键字,而 visual-studio 2008 不提供该标准。
要解决这个问题,请使用显式类型:
for (std::map<DWORD,std::string>::iterator it = m_mapShopSign.begin();
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
it != m_mapShopSign.end();
++it)
如前所述,auto
是在 C++11 中为 automatic type deduction 引入的。在 C++11 之前,它被用来声明一个具有自动存储持续时间的局部变量。
我在 Windows 10 上使用 VS2008。 我对这个功能有疑问,希望你能帮助我
void CPythonNetworkStream::AppearShopSign(DWORD dwVID, std::string stSign) {
if (stSign.empty())
for (auto it = m_mapShopSign.begin(); it != m_mapShopSign.end(); ++it)
if (dwVID == it->first)
stSign = it->second;
// LogBoxf("AppearShopSign: %u-%s", dwVID, stSign.c_str());
PyCallClassMemberFunc(m_apoPhaseWnd[PHASE_WINDOW_GAME], "BINARY_PrivateShop_Appear", Py_BuildValue("(is)", dwVID, stSign.c_str()));
}
错误信息
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
error C2440: 'initializing' : cannot convert from 'std::_Tree<_Traits>::iterator' to 'int'
error C2678: binary '!=' : no operator found which takes a left-hand operand of type 'int' (or there is no acceptable conversion)
error C2227: left of '->first' must point to class/struct/union/generic type
自从 c++11 标准以来支持 auto
关键字,而 visual-studio 2008 不提供该标准。
要解决这个问题,请使用显式类型:
for (std::map<DWORD,std::string>::iterator it = m_mapShopSign.begin();
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
it != m_mapShopSign.end();
++it)
如前所述,auto
是在 C++11 中为 automatic type deduction 引入的。在 C++11 之前,它被用来声明一个具有自动存储持续时间的局部变量。