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#include <string>
#include <typeinfo>
using namespace std;
template <typename T>
static T StringCast(string inValue)
{
    if(typeid(T) == typeid(bool))
    {
        if(inValue == "true")
            return true;
        if(inValue == "false")
            return false;
        if(inValue == "1")
            return true;
        if(inValue == "0")
            return false;
        return false;
    }
 
    std::istringstream stream(inValue);
    T t;
    stream >> t;
    return t;
}
 
class Fail {
public:
};
std::istream& operator >> (std::istream& is, Fail&) { return is; }
 
int main()
{
   Fail f;
   f = StringCast<Fail>("HA");
}

prog.cpp: In function ‘T StringCast(std::string) [with T = Fail]’:
prog.cpp:34:   instantiated from here
prog.cpp:10: error: conversion from ‘bool’ to non-scalar type ‘Fail’ requested
prog.cpp:12: error: conversion from ‘bool’ to non-scalar type ‘Fail’ requested
prog.cpp:14: error: conversion from ‘bool’ to non-scalar type ‘Fail’ requested
prog.cpp:16: error: conversion from ‘bool’ to non-scalar type ‘Fail’ requested
prog.cpp:17: error: conversion from ‘bool’ to non-scalar type ‘Fail’ requested
prog.cpp:20: error: ‘stream’ has incomplete type

Standard output is empty