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C++ programmers often have to deal with a variety of string types. From its C roots, an array of char and wchar_t is often treated as a null-terminated string. The C++ standard library provides the type std::string for convenient string handling. Many other libraries also have string implementations. For example, the MFC and ATL use the type CString. Last but not least, COM has its own string definition, the BSTR. When you write interoperability code, you often have to convert between native strings and managed strings. For example, a native client could call the following managed function: void fManaged(const char* sz); If you want to dump the null-terminated string you got as an argument via Console::WriteLine, you first have to convert it to a System::String. To achieve this, you can use a constructor of System::String that accepts a const char* argument: void fManaged(const char* sz) { Console::WriteLine(gcnew String(sz)); } For pointers to null-terminated wide character strings (wchar_t*), System::String provides an equivalent constructor. For all other native string types, you have to convert to either char* or wchar_t* so that you can use one of the String constructors mentioned. Make sure that you pick the conversion constructor that matches the internal representation of the string.

Listing 11-26. Trying to Use the Template in Another Assembly // assembly2.cpp #include "managed_template.h" #using "assembly1.dll" int main() { CTemplate<int>^ ctemplate_int = gcnew CTemplate<int>(67); CBridge^ bridge = gcnew CBridge(); bridge->F(ctemplate_int); } If we try to compile assembly2.cpp in Listing 11-26 as follows: cl /clr assembly2.cpp we ll get an error similar to the following: assembly2.cpp assembly2.cpp(12) : error C2664: 'CBridge::F' : cannot convert parameter 1 from 'CTemplate<T> ^' to 'CTemplate<int> ^' with [ T=int ] No user-defined-conversion operator available, or Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast What s the problem You can plainly see that CTemplate<T> with T = int is the same as CTemplate<int>, right Well, no. The truth of the matter is that the CTemplate<int> compiled into the first assembly is not considered the same type as the CTemplate<int> compiled into the second assembly, because the runtime sees them as two different types. The compiler won t let you compile code that tries to do this. The bottom line is that you should confine your template code to intra-assembly code. Don t expose your template classes as public classes. If you want a parameterized type to use in the public classes and methods of an assembly, use a generic type. You may often find yourself defining a generic interface to a template class. You can then use the generic interface over the assembly boundary, and use the template classes freely within each assembly. Listing 11-27 shows how you would declare such a thing.

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In 11, we had a look at temporary tables by defining a table in code prefixing the name with a hash mark (#) Temporary tables allow you to split a complex query or a query that, if built as one unit, would run slow due to the complexity of the joins SQL Server would have to do Therefore, creating a set of subdata in the first query would aid the performance of the query in the second Another scenario where you may use temporary tables is when you wish to create some sort of grouping of information and then use that grouping for further analysis As an example, you might create a temporary table that contains a sum of each day s transactions within a bank account The second part of the query takes the temporary table and uses it to calculate the daily interest accrued.

A common table expression (CTE) is a bit like a temporary table It s transient, lasting only as long as the query requires it Temporary tables are available for use during the lifetime of the session of the query running the code or until they are explicitly dropped The creation and use of temporary tables is a two- or three-part phase: table creation, population, and use A CTE is built in the same code line as the SELECT, INSERT, UPDATE, or DELETE statements that use it The best way to understand a CTE is to demonstrate an example with some code Within the AdventureWorks database, there are a number of products held in the ProductionProduct table For this example, let s say you want to know the maximum list price of stock you re holding over all the product categories.

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Using a temporary table, this would be a two-part process, as follows: USE AdventureWorks GO SELECT pProductSubcategoryID, sName,SUM(ListPrice) AS ListPrice INTO #Temp1 FROM ProductionProduct p JOIN ProductionProductSubcategory s ON sProductSubcategoryID = pProductSubcategoryID WHERE pProductSubcategoryID IS NOT NULL GROUP BY pProductSubcategoryID, sName.

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