Function IsSubstring

source/test/gtest/src/gtest.cc:1817–1820

// only), and return an appropriate error message when they fail.

AssertionResult IsSubstring(const char* needle_expr, const char* haystack_expr,
                            const char* needle, const char* haystack) {
  return IsSubstringImpl(true, needle_expr, haystack_expr, needle, haystack);
}

AssertionResult IsSubstring(const char* needle_expr, const char* haystack_expr,
                            const wchar_t* needle, const wchar_t* haystack) {