Subject: [Boost-commit] svn:boost r72982 - sandbox/conversion/libs/conversion_ext/example
From: vicente.botet_at_[hidden]
Date: 2011-07-09 09:56:39
Author: viboes
Date: 2011-07-09 09:56:38 EDT (Sat, 09 Jul 2011)
New Revision: 72982
URL: http://svn.boost.org/trac/boost/changeset/72982
Log:
updated formatted example
Text files modified:
sandbox/conversion/libs/conversion_ext/example/formatted.cpp | 145 ++++++++++++++++++++++++++++-----------
1 files changed, 104 insertions(+), 41 deletions(-)
Modified: sandbox/conversion/libs/conversion_ext/example/formatted.cpp
==============================================================================
--- sandbox/conversion/libs/conversion_ext/example/formatted.cpp (original)
+++ sandbox/conversion/libs/conversion_ext/example/formatted.cpp 2011-07-09 09:56:38 EDT (Sat, 09 Jul 2011)
@@ -8,59 +8,122 @@
//
//////////////////////////////////////////////////////////////////////////////
-//[EVEN_CPP
+//[FORMATTED_CPP
- #include <boost/conversion/extractor.hpp>
- #include <boost/conversion/std/string.hpp>
- #include <boost/conversion/convert_to_or_fallback.hpp>
- #include <strstream>
- #include <iostream>
- #include <string>
- #include <iomanip>
- #include <boost/assert.hpp>
- using namespace boost::conversion;
+#include <boost/conversion/std/string.hpp>
+#include <boost/conversion/convert_to_or_fallback.hpp>
+#include <string>
+#include <iomanip>
+#include <boost/assert.hpp>
+
+class extract_t { };
+const extract_t extract={};
+
+
+template <typename T>
+class extractor_stream {
+ std::stringstream ios_;
+ T value_;
+
+public:
+
+ template<typename U>
+ extractor_stream& operator<< (U u) { return (ios_ << u, *this); }
+
+ template<typename U>
+ extractor_stream& operator>> (U u) { return (ios_ >> u, *this); }
+
+
+ T operator>> (extract_t const&) {
+ T value;
+ ios_ >> value;
+ return value;
+ }
+
+};
+
+template <typename T>
+class extract_to { };
+
+class via_stream {
+ std::stringstream ios_;
+
+public:
+
+ template<typename U>
+ via_stream& operator<< (U u) { return (ios_ << u, *this); }
+
+ template<typename U>
+ via_stream& operator>> (U u) { return (ios_ >> u, *this); }
+
+
+ template<typename T>
+ T operator>> (extract_to<T> const&) {
+ T value;
+ ios_ >> value;
+ return value;
+ }
+
+};
- int main()
- {
- std::string hex_str = "FF"; // 255 in decimal
- std::stringstream ios;
+
+int main()
+{
+ {
+ using namespace boost::conversion;
+ {
+ std::string hex_str = "0xFF"; // 255 in decimal
// This call fails
int bad = convert_to_or_fallback<int>(hex_str, -1);
BOOST_ASSERT(bad == -1); // Failed decimal conversion from "FF"
-
- // Apply hex formatting while converting from string
- int i = convert_to<int>(extractor<int>(
- (ios.clear(), ios << hex_str, ios >> std::hex)));
- BOOST_ASSERT(i == 255); // Successful hex conversion from "FF"
-
+ }
+ {
+
+ std::string hex_str = "FF"; // 255 in decimal
+
+ // This call also fails
+ int bad = convert_to_or_fallback<int>(hex_str, -1);
+ BOOST_ASSERT(bad == -1); // Failed decimal conversion from "FF"
+
// Apply hex formatting while converting from string
-
- int ii = convert_to<int>(extractor_stream<int>() << hex_str >> std::hex >> extract);
+ int ii = extractor_stream<int>() << hex_str >> std::hex >> extract;
BOOST_ASSERT(ii == 255); // Successful hex conversion from "FF"
-
- int iii = convert_to<int>(extractor_stream<int>() << hex_str >> std::hex);
+
+ // Apply hex formatting while converting from string
+ int iii = via_stream()
+ << hex_str
+ >> std::hex >> extract_to<int>();
+
BOOST_ASSERT(iii == 255); // Successful hex conversion from "FF"
-
-#if 0
+
+ std::string si1 = via_stream()
+ << std::uppercase << std::hex << ii
+ >> extract_to<std::string>();
+
+ BOOST_ASSERT(si1 == "FF");
+
+
// Apply hex, uppercase, showbase formatting while converting to string
- std::string si = convert_to<std::string>(extractor<std::string>(
- (ios.clear(), ios << std::showbase << std::uppercase << std::hex << i, ios)));
- BOOST_ASSERT(si == "0XFF");
-
- {
+ std::string si2 = via_stream()
+ << std::showbase << std::uppercase << std::hex << ii
+ >> extract_to<std::string>();
+
+ BOOST_ASSERT(si2 == "0XFF");
+
std::string double_str = "1.2345e-02";
- std::stringstream ios;
- double d = convert_to<double>(extractor<double>(
- (ios.clear(), ios << double_str, ios >> std::setprecision(4) >> std::scientific)));
-
- std::string sd= convert_to<std::string>(extractor<std::string>(
- (ios.clear(), ios << std::setprecision(4) << std::scientific << d, ios)));
-
+ double d = via_stream() << double_str
+ >> extract_to<double>();
+
+ std::string sd= via_stream()
+ << std::setprecision(4) << std::scientific << d
+ >> extract_to<std::string>();
+
BOOST_ASSERT(sd == double_str);
- }
-#endif
- return 0;
}
+ }
+
+ return 0;
+}
//]