命名空間'std'中的'underlying_type_t'錯誤未在項目-OSRM中的example.cpp中命名模板類型

Question

我嘗試執行Project-OSRM的examle.cpp文件。我做了以下步驟：從源

• 構建OSRM如上所述here
• 在新終端：CD OSRM-後端/例如，在終端
• ：cmake的..在終端
• ：cmake的 - 建立。
• 在終端中：sudo cmake --build。 --target安裝
• 移動地圖承包商，引擎，提取，分區，存儲，UTIL從在/ usr /本地/包括/ OSRM到在/ usr /本地/包括（否則錯誤映射不是在/ usr /本地/包括）在終端
• ：克++ -std = C++ 11 example.cpp -o例如

但我得到的錯誤

‘underlying_type_t’ in namespace ‘std’ does not name a template type 
    static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>> 

有沒有人有一個想法是什麼，我做錯了或什麼錯誤，以及如何解決這個問題？

錯誤消息

In file included from /usr/local/include/engine/api/match_parameters.hpp:31:0, 
       from /usr/local/include/osrm/match_parameters.hpp:31, 
       from example.cpp:1: 
/usr/local/include/engine/api/route_parameters.hpp: In function ‘bool osrm::engine::api::operator&(osrm::engine::api::RouteParameters::AnnotationsType, osrm::engine::api::RouteParameters::AnnotationsType)’: 
/usr/local/include/engine/api/route_parameters.hpp:144:26: error: ‘underlying_type_t’ in namespace ‘std’ does not name a template type 
     static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(l 
         ^
/usr/local/include/engine/api/route_parameters.hpp:144:43: error: expected ‘>’ before ‘<’ token 
     static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(l 
             ^
/usr/local/include/engine/api/route_parameters.hpp:144:43: error: expected ‘(’ before ‘<’ token 
/usr/local/include/engine/api/route_parameters.hpp:144:43: error: expected primary-expression before ‘<’ token 
/usr/local/include/engine/api/route_parameters.hpp:144:76: error: expected primary-expression before ‘>>’ token 
    static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(lhs) & 
                    ^
/usr/local/include/engine/api/route_parameters.hpp:145:26: error: ‘underlying_type_t’ in namespace ‘std’ does not name a template type 
     static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(r 
         ^
/usr/local/include/engine/api/route_parameters.hpp:145:43: error: expected ‘>’ before ‘<’ token 
     static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(r 
             ^
/usr/local/include/engine/api/route_parameters.hpp:145:43: error: expected ‘(’ before ‘<’ token 
/usr/local/include/engine/api/route_parameters.hpp:145:43: error: expected primary-expression before ‘<’ token 
/usr/local/include/engine/api/route_parameters.hpp:145:76: error: expected primary-expression before ‘>>’ token 
    static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(rhs)); 
                    ^
/usr/local/include/engine/api/route_parameters.hpp:145:84: error: expected ‘)’ before ‘;’ token 
    static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(rhs)); 
                      ^
/usr/local/include/engine/api/route_parameters.hpp:145:84: error: expected ‘)’ before ‘;’ token 
/usr/local/include/engine/api/route_parameters.hpp: In function ‘osrm::engine::api::RouteParameters::AnnotationsType osrm::engine::api::operator|(osrm::engine::api::RouteParameters::AnnotationsType, osrm::engine::api::RouteParameters::AnnotationsType)’: 
/usr/local/include/engine/api/route_parameters.hpp:152:26: error: ‘underlying_type_t’ in namespace ‘std’ does not name a template type 
     static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(l 
         ^
/usr/local/include/engine/api/route_parameters.hpp:152:43: error: expected ‘>’ before ‘<’ token 
     static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(l 
             ^
/usr/local/include/engine/api/route_parameters.hpp:152:43: error: expected ‘(’ before ‘<’ token 
/usr/local/include/engine/api/route_parameters.hpp:152:43: error: expected primary-expression before ‘<’ token 
/usr/local/include/engine/api/route_parameters.hpp:152:76: error: expected primary-expression before ‘>>’ token 
    static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(lhs) | 
                    ^
/usr/local/include/engine/api/route_parameters.hpp:153:26: error: ‘underlying_type_t’ in namespace ‘std’ does not name a template type 
     static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(r 
         ^
/usr/local/include/engine/api/route_parameters.hpp:153:43: error: expected ‘>’ before ‘<’ token 
     static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(r 
             ^
/usr/local/include/engine/api/route_parameters.hpp:153:43: error: expected ‘(’ before ‘<’ token 
/usr/local/include/engine/api/route_parameters.hpp:153:43: error: expected primary-expression before ‘<’ token 
/usr/local/include/engine/api/route_parameters.hpp:153:76: error: expected primary-expression before ‘>>’ token 
    static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(rhs)); 
                    ^
/usr/local/include/engine/api/route_parameters.hpp:153:84: error: expected ‘)’ before ‘;’ token 
    static_cast<std::underlying_type_t<RouteParameters::AnnotationsType>>(rhs)); 
                      ^
/usr/local/include/engine/api/route_parameters.hpp:153:84: error: expected ‘)’ before ‘;’ token 

Answer 1

underlying_type_t需要C++ 14。爲了能夠使用它，將-std=c++14傳遞給您的編譯器。