invariant from class fcf::ResolveData

Property: invariant

Type: bool

Class: fcf::ResolveData

Package: fcfBasis

File: bits/PartSpecificator/ResolveSpecificatorDefinition.hpp

Available from version: 1.0.1

The flag indicating whether an object can store different types of data

Equals true if the object can store different data types (for example, fcf::Variant).

Equals false if the object can store only one data type.

Example:

#include <iostream> #define FCF_BASIS_IMPLEMENTATION #include <fcfBasis/basis.hpp> int main() { // Variant object that stores the std::string in itself fcf::Variant variant = "some string"; // We get information about the type const fcf::TypeInfo* ti = fcf::Type< fcf::Variant >().typeInfo(); // We get the function of the processor of the specificator using the method specificatorCall fcf::ResolveSpecificator::CallType call = ti->specificatorCall<fcf::ResolveSpecificator>(); // We get information about the stored object in the variant object fcf::ResolveData resolveData =call(&variant); // The index of the stored type std::cout << "Type index: " << resolveData.typeIndex << std::endl; // The name of the stored type std::cout << "Type name: " << fcf::getTypeInfo(resolveData.typeIndex)->name << std::endl; // Indicating that the given container may contain a random type of data std::cout << "Invariant state: " << resolveData.invariant << std::endl; // The pointer for the stored data std::cout << "Data: " << *(std::string*)resolveData.data << std::endl; return 0; }

Output:

Type index: 30 Type name: std::string Invariant state: 1 Data: some string