


De-Mangler for std::type_info::name: Unveiling the Demystified Name
The name mangled by std::type_info remains enigmatic, rendering it challenging to comprehend the underlying type. The quest for a solution that demangles this enigma has led to the exploration of various approaches.
Demangling the Mangled Name
One solution leverages C 11's powerful features and g 's libstdc library through the abi::__cxa_demangle function. This function decodes the mangled name, returning a human-readable string.
C 11 Implementation
In the C 11 implementation, the demangle function is included in the "type.hpp" header file, and the actual demangling logic resides in "type.cpp." The following code snippet illustrates:
#include "type.hpp" std::string demangle(const char* name) { int status = -4; std::unique_ptr<char void> res { abi::__cxa_demangle(name, NULL, NULL, &status), std::free }; return (status==0) ? res.get() : name ; }</char>
C 98 Compatible Version
For those not utilizing C 11, an alternative remains available. The C 98 compatible implementation in "type.cpp" employs a different technique to demangle the name:
#include "type.hpp" struct handle { char* p; handle(char* ptr) : p(ptr) { } ~handle() { std::free(p); } }; std::string demangle(const char* name) { int status = -4; handle result( abi::__cxa_demangle(name, NULL, NULL, &status) ); return (status==0) ? result.p : name ; }
Usage and Considerations
The demangled name can be retrieved using the type function, which accepts a reference to the type to be demangled. The following code demonstrates its usage:
#include "type.hpp" struct Base { virtual ~Base() {} }; struct Derived : public Base { }; int main() { Base* ptr_base = new Derived(); std::cout <p><strong>Conclusion</strong></p><p>With these techniques, developers can now unveil the hidden identities of mangled type names, gaining a clearer understanding of the types involved in their code.</p>
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