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Provide a utility for convert types with matching member symbols. More...
| bdlat_SymbolicConverter | symbolic converter utility |
bdlat_SymbolicConverter utility provided by this component defines a single parameterized function convert. The convert function takes two arguments: a destination and a source object. The destination and source objects may be of different types. Category Reference -------- --------- Sequence bdlat_sequencefunctions Choice bdlat_choicefunctions Array bdlat_arrayfunctions Enumeration bdlat_enumfunctions NullableValue bdlat_nullablevaluefunctions CustomizedType bdlat_customizedtypefunctions Simple basic C++ fundamental types & other value-semantic types
bdlat_SymbolicConverter utility converts from one type to another using the following criteria: Destination Category Source Category Comments -------------------- --------------- -------- Sequence Sequence The conversion will fail if each attribute in the set of attributes from the source does not have a corresponding attribute (with the same name) in the destination. The conversion will also fail if any attributes from the source fail to convert to the corresponding attribute in the destination. Any attribute in the destination that does not have a corresponding attribute in the source will be set to its default value. Choice Choice The conversion will fail if the destination does not have a selection with the same name as the current selection in the source. The conversion will also fail if the selection from the source fails to convert to the corresponding selection in the destination. If nothing is selected in the source, then the destination will be reset. Array Array The conversion will fail if the elements in the source fail to convert to the elements in the destination. Upon completion, the destination array will contain the same number of elements as the source array. Enumeration Enumeration The conversion will fail if the destination does not have a string value that is identical to the string value of the source. Enumeration char/short/int The conversion will fail if the destination does not have an enumerator with the numeric value of the source. char/short/int Enumeration The conversion will fail if the numeric value of the enumeration is outside the bounds of the destination type. Enumeration bsl::string The conversion will fail if the destination does not have an enumerator with the symbolic string name of the source. bsl::string Enumeration This conversion always succeeds. NullableValue NullableValue The conversion will fail if the source has a value that fails to convert to the destination value. If the source is null, then the destination is nulled. NullableValue AnyType The conversion will fail if the source fails to convert to the destination value. AnyType NullableValue The conversion will fail if the source is not null and the value in the source fails to convert to the destination. If the source is null, then the destination will be set to its default value. CustomizedType CustomizedType The conversion will fail if the base value in the source fails to convert to the base value in the destination and the base value is able to convert to the customized value. CustomizedType AnyType The conversion will fail if the source fails to convert to the base value in the destination and the base value is able to convert to the customized value. AnyType CustomizedType The conversion will fail if the base value in the source fails to convert to the destination. SimpleType SimpleType The conversion will fail if there is no accessible compile-time assignment operator from the destination to the source. This is determined using 'bslmf_isconvertible'.
bdlat framework. In particular, types generated by the bas_codegen.pl tool can be used. For example, suppose we have the following XML schema inside a file called xsdfile.xsd: <?xml version='1.0' encoding='UTF-8'?> <xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:bdem='http://bloomberg.com/schemas/bdem' elementFormDefault='unqualified'> <xs:complexType name='Employee'> <xs:sequence> <xs:element name='Name' type='string'/> <xs:element name='Dept' type='string'/> <xs:element name='Age' type='int'/> <xs:element name='Salary' type='float'/> </xs:sequence> </xs:complexType> <xs:complexType name='Trainee'> <xs:sequence> <xs:element name='Name' type='string'/> <xs:element name='Dept' type='string'/> <xs:element name='Age' type='int'/> </xs:sequence> </xs:complexType> </xs:schema>
bas_codegen.pl tool, we can generate C++ classes for this schema: $ bas_codegen.pl -g h -g cpp -p test xsdfile.xsd
test_employee and test_trainee components in the current directory. hireTrainee function, that converts a trainee to an employee. Such a function could be written as follows: #include <test_employee.h> #include <test_trainee.h> #include <bdlat_symbolicconverter.h> using namespace BloombergLP; int hireTrainee(test::Employee *result, const test::Trainee& trainee, float salary) { int retCode = bdlat_SymbolicConverter::convert(result, trainee); result->salary() = salary; return retCode; }
hireTrainee function can be used as follows: void usageExample() { test::Trainee trainee; trainee.name() = "Bob"; trainee.dept() = "RnD"; trainee.age() = 24; test::Employee employee; int result = hireTrainee(&employee, trainee, 20000.00f); assert(0 == result); assert("Bob" == employee.name()); assert("RnD" == employee.dept()); assert(24 == employee.age()); assert(20000.00f == employee.salary()); }
1.7.1