namespaces

问题 So, I am trying to use the coinbase API. I'm attempting a simple test to see if I can make it work, but I'm getting various composer errors. Currently, I am getting unexpected t 'use' for this code: use Coinbase\Wallet\Client; use Coinbase\Wallet\Configuration; $apiKey = 'public'; $apiSecret = 'private'; $configuration = Configuration::apiKey($apiKey, $apiSecret); $client = Client::create($configuration); $spotPrice = $client->getSpotPrice(); echo $spotPrice; So, are my use statements in the

问题 So, I am trying to use the coinbase API. I'm attempting a simple test to see if I can make it work, but I'm getting various composer errors. Currently, I am getting unexpected t 'use' for this code: use Coinbase\Wallet\Client; use Coinbase\Wallet\Configuration; $apiKey = 'public'; $apiSecret = 'private'; $configuration = Configuration::apiKey($apiKey, $apiSecret); $client = Client::create($configuration); $spotPrice = $client->getSpotPrice(); echo $spotPrice; So, are my use statements in the

问题 I need to change namespaces in the root element as follows: input document: <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <foo xsi:schemaLocation="urn:isbn:1-931666-22-9 http://www.loc.gov/ead/ead.xsd" xmlns:ns2="http://www.w3.org/1999/xlink" xmlns="urn:isbn:1-931666-22-9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> desired output: <foo audience="external" xsi:schemaLocation="urn:isbn:1-931666-22-9 http://www.loc.gov/ead/ead.xsd" xmlns:xsi="http://www.w3.org/2001

问题 My application uses another output than the standard output for logging information, which is why I wrote my own Log() , Error() , Panic() and Assert() functions. To organize things nicely, I enclose all the debugging stuff in a Debug namespace. It would make more sense for the Assert() function to also provide a source file and line number, which is only possible using the __LINE__ and __FILE__ macros. However, it is pretty unpleasant, inefficient etc... to always have to specify these two

问题 I am parsing an xml file generated by an external program. I would then like to add custom annotations to this file, using my own namespace. My input looks as below: <sbml xmlns="http://www.sbml.org/sbml/level2/version4" xmlns:celldesigner="http://www.sbml.org/2001/ns/celldesigner" level="2" version="4"> <model metaid="untitled" id="untitled"> <annotation>...</annotation> <listOfUnitDefinitions>...</listOfUnitDefinitions> <listOfCompartments>...</listOfCompartments> <listOfSpecies> <species

问题 I have a C# program, how can I check at runtime if a namespace, class, or method exists? Also, how to instantiate a class by using it's name in the form of string? Pseudocode: string @namespace = "MyNameSpace"; string @class = "MyClass"; string method= "MyMEthod"; var y = IsNamespaceExists(namespace); var x = IsClassExists(@class)? new @class : null; //Check if exists, instantiate if so. var z = x.IsMethodExists(method); 回答1: You can use Type.GetType(string) to reflect a type. GetType will

问题 I have this function declaration: template<class T> a::A& a::A::operator<<(T out) { std::cout << out; return (*this); } and this function definition: namespace a { ... class A { ... template<class T> A& operator<<(T); And I call it as: a::A b; b << 1; and this is the Makefile: app: main.o A.o g++ main.o A.o -o app main.o: main.cpp g++ -c main.cpp A.o: A.cpp g++ -c A.cpp and it gives me: Undefined symbols: a::A& a::A::operator<< <int>(int) why is that? 回答1: The function template will be turned

问题 How to create xml document with node prefix like: <sphinx:docset> <sphinx:schema> <sphinx:field name="subject"/> <sphinx:field name="content"/> <sphinx:attr name="published" type="timestamp"/> </sphinx:schema> When I try to run something like new XElement("sphinx:docset") i getting exception Unhandled Exception: System.Xml.XmlException: The ':' character, hexadecimal val ue 0x3A, cannot be included in a name. at System.Xml.XmlConvert.VerifyNCName(String name, ExceptionType exceptionTyp e) at

问题 How to create xml document with node prefix like: <sphinx:docset> <sphinx:schema> <sphinx:field name="subject"/> <sphinx:field name="content"/> <sphinx:attr name="published" type="timestamp"/> </sphinx:schema> When I try to run something like new XElement("sphinx:docset") i getting exception Unhandled Exception: System.Xml.XmlException: The ':' character, hexadecimal val ue 0x3A, cannot be included in a name. at System.Xml.XmlConvert.VerifyNCName(String name, ExceptionType exceptionTyp e) at

问题 I come from a Java background, where packages are used, not namespaces. I'm used to putting classes that work together to form a complete object into packages, and then reusing them later from that package. But now I'm working in C++. How do you use namespaces in C++? Do you create a single namespace for the entire application, or do you create namespaces for the major components? If so, how do you create objects from classes in other namespaces? 回答1: Namespaces are packages essentially. They