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#include <string>
#include <type_traits>
 
template<
  class T, 
  class = typename std::enable_if<
                       std::is_same<float,
                                    typename std::decay<T>::type>::value>::type>
void function(T&& t){/*SNIP*/}
 
int main()
{
    float f = 1.0f;
    const float& fr = f;
 
    function(f);    // OK
    function (fr);  // OK
 
    function(std::string()); // !OK
 
    return 0;
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:19:27: error: no matching function for call to ‘function(std::string)’
prog.cpp:19:27: note: candidate is:
prog.cpp:9:6: note: template<class T, class> void function(T&&)
prog.cpp:9:6: note:   template argument deduction/substitution failed:
prog.cpp:6:3: error: no type named ‘type’ in ‘struct std::enable_if<false, void>’

Standard output is empty