include

问题 I want to write a regular expression in c++ to match a #include preprocessing directive. So I wrote this: std::regex includePattern("^[[:blank:]|[:space:]]*#[[:blank:]|[:space:]]*include[[:blank:]|[:space:]]+[<|\"]{1}[_[:alpha:]]+[_[:alnum:]]*"); This is worked for: std::string matchString = "#include <vector>"; But only matches parts of the string excluded the trailing ">", but if I change the regex to this: std::regex includePattern("^[[:blank:]|[:space:]]*#[[:blank:]|[:space:]]*include[[

问题 In my first.cpp I put #include second.h . As a consequence first.cpp sees the content of second.cpp . In second.cpp I put #include third.h . My question is: will first.cpp see the content of the third.cpp ? ADDED I thought that if I include second.h I will be able to use functions declared in second.h and described (defined, written) in the second.cpp. In this sense the content of the second.cpp becomes available to the first.cpp 回答1: You can think about #include as a simple text insert. But

问题 I have a One-Many relation with two Entities : Order: int OrderId string OrderNumber ... OrderItem: int ItemId int sequence ... Product: int ProductId string ProductName ProductType: int ProductTypeid string Title One Order Has multiple OrderItems , and each OrderItem has One Product and each Product has one ProductType . I want to write a Linq that return all orders with their items , Product , ProductType and items be sorted by sequence field. How can I write a query such as following query

问题 I have a One-Many relation with two Entities : Order: int OrderId string OrderNumber ... OrderItem: int ItemId int sequence ... Product: int ProductId string ProductName ProductType: int ProductTypeid string Title One Order Has multiple OrderItems , and each OrderItem has One Product and each Product has one ProductType . I want to write a Linq that return all orders with their items , Product , ProductType and items be sorted by sequence field. How can I write a query such as following query

问题 I have a One-Many relation with two Entities : Order: int OrderId string OrderNumber ... OrderItem: int ItemId int sequence ... Product: int ProductId string ProductName ProductType: int ProductTypeid string Title One Order Has multiple OrderItems , and each OrderItem has One Product and each Product has one ProductType . I want to write a Linq that return all orders with their items , Product , ProductType and items be sorted by sequence field. How can I write a query such as following query

问题 I'm using the PHP include function to include static PHP and JS content within my Wordpress pages (made possible with the ezPHP plugin). The PHP is working fine, but the JS isn't. I'm getting "illegal character" errors. Every instance of && is being changed to the html code for && (I tried including it here, but it renders the character). To try to fix this, I've (1) disabled Wordpress's WYSIWYG editor for my user, (2) under Settings > Writing , unchecked "WordPress should correct invalidly

问题 I'm using the PHP include function to include static PHP and JS content within my Wordpress pages (made possible with the ezPHP plugin). The PHP is working fine, but the JS isn't. I'm getting "illegal character" errors. Every instance of && is being changed to the html code for && (I tried including it here, but it renders the character). To try to fix this, I've (1) disabled Wordpress's WYSIWYG editor for my user, (2) under Settings > Writing , unchecked "WordPress should correct invalidly

问题 I'm using the PHP include function to include static PHP and JS content within my Wordpress pages (made possible with the ezPHP plugin). The PHP is working fine, but the JS isn't. I'm getting "illegal character" errors. Every instance of && is being changed to the html code for && (I tried including it here, but it renders the character). To try to fix this, I've (1) disabled Wordpress's WYSIWYG editor for my user, (2) under Settings > Writing , unchecked "WordPress should correct invalidly

问题 Let's assume I define BAR in foo.h. But foo.h might not exist. How do I include it, without the compiler complaining at me? #include "foo.h" #ifndef BAR #define BAR 1 #endif int main() { return BAR; } Therefore, if BAR was defined as 2 in foo.h, then the program would return 2 if foo.h exists and 1 if foo.h does not exist. 回答1: In general, you'll need to do something external to do this - e.g. by doing something like playing around with the search path (as suggested in the comments) and

问题 Let's assume I define BAR in foo.h. But foo.h might not exist. How do I include it, without the compiler complaining at me? #include "foo.h" #ifndef BAR #define BAR 1 #endif int main() { return BAR; } Therefore, if BAR was defined as 2 in foo.h, then the program would return 2 if foo.h exists and 1 if foo.h does not exist. 回答1: In general, you'll need to do something external to do this - e.g. by doing something like playing around with the search path (as suggested in the comments) and