zenilib: zenilib/jni/external/angle/src/compiler/preprocessor/numeric_lex.h Source File

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numeric_lex.h
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1 //
2 // Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
3 // Use of this source code is governed by a BSD-style license that can be
4 // found in the LICENSE file.
5 //
6
7 // numeric_lex.h: Functions to extract numeric values from string.
8
9 #ifndef COMPILER_PREPROCESSOR_NUMERIC_LEX_H_
10 #define COMPILER_PREPROCESSOR_NUMERIC_LEX_H_
11
12 #include <sstream>
13
14 namespace pp {
15
16 inline std::ios::fmtflags numeric_base_int(const std::string& str)
17 {
18 if ((str.size() >= 2) &&
19 (str[0] == '0') &&
20 (str[1] == 'x' || str[1] == 'X'))
21 {
22 return std::ios::hex;
23 }
24 else if ((str.size() >= 1) && (str[0] == '0'))
25 {
26 return std::ios::oct;
27 }
28 return std::ios::dec;
29 }
30
31 // The following functions parse the given string to extract a numerical
32 // value of the given type. These functions assume that the string is
33 // of the correct form. They can only fail if the parsed value is too big,
34 // in which case false is returned.
35
36 template<typename IntType>
37 bool numeric_lex_int(const std::string& str, IntType* value)
38 {
39 std::istringstream stream(str);
40 // This should not be necessary, but MSVS has a buggy implementation.
41 // It returns incorrect results if the base is not specified.
42 stream.setf(numeric_base_int(str), std::ios::basefield);
43
44 stream >> (*value);
45 return !stream.fail();
46 }
47
48 template<typename FloatType>
49 bool numeric_lex_float(const std::string& str, FloatType* value)
50 {
51 std::istringstream stream(str);
52 // Force "C" locale so that decimal character is always '.', and
53 // not dependent on the current locale.
54 stream.imbue(std::locale::classic());
55
56 stream >> (*value);
57 return !stream.fail();
58 }
59
60 } // namespace pp.
61 #endif // COMPILER_PREPROCESSOR_NUMERIC_LEX_H_
stream
GLuint GLuint stream
Definition: glew.h:6573
pp
png_sPLT_entryp pp
Definition: pngrutil.c:1375
pp::numeric_base_int
std::ios::fmtflags numeric_base_int(const std::string &str)
Definition: numeric_lex.h:16
value
EGLSurface EGLint void ** value
Definition: eglext.h:301
pp::numeric_lex_int
bool numeric_lex_int(const std::string &str, IntType *value)
Definition: numeric_lex.h:37
string
GLsizei const GLcharARB ** string
Definition: glew.h:5638
pp::numeric_lex_float
bool numeric_lex_float(const std::string &str, FloatType *value)
Definition: numeric_lex.h:49
str
#define str(s)