Class: fcf::TypeInfo
Package: fcfBasis
File: bits/PartType/TypeInfoDefinition.hpp
Available from version: 1.0.1
Retrieves a universal call function pointer for the given specificator.
The method returns a fcf::UniversalCall function pointer, which can be used to invoke the specificator operation on a fcf::Variant or other objects via the framework's universal calling mechanism.
If no specificator handler function is defined for the specified specificator, calling the fcf::TypeInfo::specificatorUniversalCall method without parameters will throw a fcf::SpecificatorNotFoundException exception.
If the function instance is called with the parameter that takes a pointer to an error object, then the exception will not be thrown if there is no handler.
Template arguments
TSpecificator
- Type of specificator
Arguments
fcf::Exception* a_error
- The argument is a pointer to the object of fcf::Exception, whose fields will be filled in case of error. If the argument is passed as zero, then in case of error, the function will return zero.
Result
fcf::UniversalCall
- A universal function pointer for the specificator.
Example: Getting the universal call function
#include <iostream>
#define FCF_BASIS_IMPLEMENTATION
#include <fcfBasis/basis.hpp>
int main() {
// Variant object that stores the std::string in itself
fcf::Variant variantStr1 = "string 1";
fcf::Variant variantStr2 = "string 2";
// We get information about the type
const fcf::TypeInfo* ti = fcf::Type< fcf::Variant >().typeInfo();
// We get the universal call function of the processor of the specificator using the method specificatorUniversalCall
fcf::UniversalCall call = ti->specificatorUniversalCall<fcf::LessSpecificator>(0);
if (call) {
// Using the universal call to compare the variant with itself (as an example of usage)
std::cout << "Universal call pointer obtained successfully." << std::endl;
fcf::Variant result = call(&variantStr1, &variantStr2, 1);
std::cout << "Compare ('" << variantStr1 << "' < '" << variantStr2 << "') : " << result << std::endl;
} else {
std::cout << "Specificator not found." << std::endl;
}
return 0;
}
Output:
Universal call pointer obtained successfully.
Compare ('string 1' < 'string 2') : true
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