Adding cython v0.20.2 in third-party.

third_party/cython/src/Cython/Includes/libcpp/string.pxd

Index: third_party/cython/src/Cython/Includes/libcpp/string.pxd
diff --git a/third_party/cython/src/Cython/Includes/libcpp/string.pxd b/third_party/cython/src/Cython/Includes/libcpp/string.pxd
new file mode 100644
index 0000000000000000000000000000000000000000..96cc52dcc9767d79a31425df257a37abe225fb51
--- /dev/null
+++ b/third_party/cython/src/Cython/Includes/libcpp/string.pxd
@@ -0,0 +1,122 @@
+
+# deprecated cimport for backwards compatibility:
+from libc.string cimport const_char
+
+
+cdef extern from "<string>" namespace "std":
+
+    size_t npos = -1
+
+    cdef cppclass string:
+        string() nogil except +
+        string(char *) nogil except +
+        string(char *, size_t) nogil except +
+        string(string&) nogil except +
+        # as a string formed by a repetition of character c, n times.
+        string(size_t, char) nogil except +
+
+        const char* c_str() nogil
+        const char* data() nogil
+        size_t size() nogil
+        size_t max_size() nogil
+        size_t length() nogil
+        void resize(size_t) nogil
+        void resize(size_t, char c) nogil
+        size_t capacity() nogil
+        void reserve(size_t) nogil
+        void clear() nogil
+        bint empty() nogil
+
+        char& at(size_t) nogil
+        char& operator[](size_t) nogil
+        int compare(string&) nogil
+
+        string& append(string&) nogil
+        string& append(string&, size_t, size_t) nogil
+        string& append(char *) nogil
+        string& append(char *, size_t) nogil
+        string& append(size_t, char) nogil
+
+        void push_back(char c) nogil
+
+        string& assign (string&) nogil
+        string& assign (string&, size_t, size_t) nogil
+        string& assign (char *, size_t) nogil
+        string& assign (char *) nogil
+        string& assign (size_t n, char c) nogil
+
+        string& insert(size_t, string&) nogil
+        string& insert(size_t, string&, size_t, size_t) nogil
+        string& insert(size_t, char* s, size_t) nogil
+
+
+        string& insert(size_t, char* s) nogil
+        string& insert(size_t, size_t, char c) nogil
+
+        size_t copy(char *, size_t, size_t) nogil
+
+        size_t find(string&) nogil
+        size_t find(string&, size_t) nogil
+        size_t find(char*, size_t pos, size_t) nogil
+        size_t find(char*, size_t pos) nogil
+        size_t find(char, size_t pos) nogil
+
+        size_t rfind(string&, size_t) nogil
+        size_t rfind(char* s, size_t, size_t) nogil
+        size_t rfind(char*, size_t pos) nogil
+        size_t rfind(char c, size_t) nogil
+        size_t rfind(char c) nogil
+
+        size_t find_first_of(string&, size_t) nogil
+        size_t find_first_of(char* s, size_t, size_t) nogil
+        size_t find_first_of(char*, size_t pos) nogil
+        size_t find_first_of(char c, size_t) nogil
+        size_t find_first_of(char c) nogil
+
+        size_t find_first_not_of(string&, size_t) nogil
+        size_t find_first_not_of(char* s, size_t, size_t) nogil
+        size_t find_first_not_of(char*, size_t pos) nogil
+        size_t find_first_not_of(char c, size_t) nogil
+        size_t find_first_not_of(char c) nogil
+
+        size_t find_last_of(string&, size_t) nogil
+        size_t find_last_of(char* s, size_t, size_t) nogil
+        size_t find_last_of(char*, size_t pos) nogil
+        size_t find_last_of(char c, size_t) nogil
+        size_t find_last_of(char c) nogil
+
+        size_t find_last_not_of(string&, size_t) nogil
+        size_t find_last_not_of(char* s, size_t, size_t) nogil
+        size_t find_last_not_of(char*, size_t pos) nogil
+
+        string substr(size_t, size_t) nogil
+        string substr() nogil
+        string substr(size_t) nogil
+
+        size_t find_last_not_of(char c, size_t) nogil
+        size_t find_last_not_of(char c) nogil
+
+        #string& operator= (string&)
+        #string& operator= (char*)
+        #string& operator= (char)
+
+        string operator+ (string& rhs) nogil
+        string operator+ (char* rhs) nogil
+
+        bint operator==(string&) nogil
+        bint operator==(char*) nogil
+
+        bint operator!= (string& rhs ) nogil
+        bint operator!= (char* ) nogil
+
+        bint operator< (string&) nogil
+        bint operator< (char*) nogil
+
+        bint operator> (string&) nogil
+        bint operator> (char*) nogil
+
+        bint operator<= (string&) nogil
+        bint operator<= (char*) nogil
+
+        bint operator>= (string&) nogil
+        bint operator>= (char*) nogil