Checking overloads for sin and cos functions in C++11

test.cpp

#include <cmath>
#include <type_traits>

static_assert(std::is_same<float, decltype(std::sin(3.1f))>::value,
        "std::sin not overloaded for float");
static_assert(std::is_same<double, decltype(std::sin(3.1))>::value,
        "std::sin not overloaded for double");
static_assert(std::is_same<long double, decltype(std::sin(3.1l))>::value,
        "std::sin not overloaded for long double");

static_assert(std::is_same<float, decltype(::sin(3.1f))>::value,
        "::sin not overloaded for float");
static_assert(std::is_same<double, decltype(::sin(3.1))>::value,
        "::sin not overloaded for double");
static_assert(std::is_same<long double, decltype(::sin(3.1l))>::value,
        "::sin not overloaded for long double");

// With gcc version 4.7.2, compiling with g++ -std=c++11 -c test.cpp, I get:
//
// test.cpp:11:1: error: static assertion failed: ::sin not overloaded for float
// test.cpp:15:1: error: static assertion failed: ::sin not overloaded for long double