template <typename Ty> Ty*
cast()
Class: fcf::NTest::SharedPtrAny
Package: fcfTest
File: test.hpp
Available from version: 1.1.1
Attempts to cast the managed object to a specific type using runtime type information (RTTI).
The cast method provides a type-safe way to retrieve the underlying object from the fcf::NTest::SharedPtrAny container.
It uses Runtime Type Information (RTTI) to verify if the stored object matches the requested type. This is a non-throwing operation: if the types do not match, the method returns nullptr instead of throwing an exception, allowing for safe conditional access.
Template arguments
Ty
- The target type to which the managed object should be cast.
Result
Ty*
- A pointer to the managed object of type Ty if the types match; otherwise, nullptr.
Example: Safe Type Casting
Demonstrates how to safely cast a managed object to its original type and how the method handles incorrect type requests.
#define FCF_TEST_IMPLEMENTATION
#include <fcfTest/test.hpp>
#include <string>
#include <iostream>
FCF_TEST_DECLARE("SharedPtrAny", "Demo", "CastExample"){
struct TargetType {
std::string data;
TargetType(std::string d) : data(d) {}
};
// 1. Create a SharedPtrAny holding a TargetType object
fcf::NTest::SharedPtrAny ptr = fcf::NTest::SharedPtrAny::make<TargetType>("Success");
// 2. Successful cast
// We provide the correct type, so cast returns a valid pointer
TargetType* validPtr = ptr.cast<TargetType>();
FCF_TEST(validPtr != nullptr, "Cast should succeed for the correct type");
FCF_TEST(validPtr->data == "Success", validPtr->data);
// 3. Unsuccessful cast
// We request an incorrect type (int), so cast returns nullptr
int* invalidPtr = ptr.cast<int>();
FCF_TEST(invalidPtr == nullptr, "Cast should return nullptr for incorrect type");
// 4. Safe usage pattern
if (TargetType* safePtr = ptr.cast<TargetType>()) {
fcf::NTest::log() << "Retrieved data: " << safePtr->data << std::endl;
}
}
int main(int a_argc, char* a_argv[]) {
bool error = false;
fcf::NTest::cmdRun(a_argc, a_argv, fcf::NTest::CRM_RUN, &error);
return error ? 1 : 0;
}
Output:
Performing the test: "SharedPtrAny" -> "Demo" -> "CastExample" ...
> Retrieved data: Success
[SUCCESS] Test completed successfully (0.000`007`960 sec)
[SUCCESS] All tests were completed.
Tests: 1 passed, 0 failed, 0 skipped, 1 total
Duration: 0.000`007`960 sec
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