| 1 | #include <boost/cstdint.hpp>
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| 2 | #include <boost/lexical_cast.hpp>
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| 3 | #include <boost/type_traits.hpp>
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| 4 | #include <boost/date_time.hpp>
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| 5 | #include <iostream>
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| 6 |
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| 7 |
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| 8 | template <typename Target, typename Source, bool val> struct helper
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| 9 | {
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| 10 | /// Default action is to use lexical_cast
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| 11 | static Target get(const Source & src)
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| 12 | {
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| 13 | return boost::lexical_cast<Target>(src);
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| 14 | }
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| 15 |
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| 16 | };
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| 17 |
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| 18 |
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| 19 | template <typename Target, typename Source> struct helper<Target, Source, true>
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| 20 | {
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| 21 |
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| 22 | /// Use this if Target and Source identical
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| 23 | static Target get(const Source & src)
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| 24 | {
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| 25 | return src;
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| 26 | }
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| 27 | };
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| 28 |
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| 29 |
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| 30 | template <typename Target, typename Source> Target my_lexical_cast(const Source & res)
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| 31 | {
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| 32 | /// Use boost::is_same for checking identity of Target and Source
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| 33 | return helper<Target, Source, boost::is_same<Target, Source>::value>::get(res);
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| 34 | }
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| 35 |
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| 36 |
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| 37 |
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| 38 |
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| 39 | const int MAX_ITER = 1000000;
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| 40 |
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| 41 | template <typename Target> void test_lexical_cast(const char * typeName)
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| 42 | {
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| 43 | boost::posix_time::ptime start = boost::posix_time::microsec_clock::universal_time();
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| 44 |
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| 45 | int i = MAX_ITER;
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| 46 | while ((--i) > 0)
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| 47 | {
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| 48 | std::string b1 = "10";
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| 49 | Target b3 = boost::lexical_cast<Target>(b1);
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| 50 | }
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| 51 |
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| 52 | boost::posix_time::ptime finish = boost::posix_time::microsec_clock::universal_time();
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| 53 | boost::posix_time::time_duration dur = finish - start;
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| 54 | std::cout << typeName << dur.total_microseconds() << std::endl;
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| 55 | }
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| 56 |
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| 57 | template <typename Target> void test_my_lexical_cast(const char * typeName)
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| 58 | {
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| 59 | boost::posix_time::ptime start = boost::posix_time::microsec_clock::universal_time();
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| 60 |
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| 61 | int i = MAX_ITER;
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| 62 | while ((--i) > 0)
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| 63 | {
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| 64 | std::string b1 = "10";
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| 65 | Target b3 = my_lexical_cast<Target>(b1);
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| 66 | }
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| 67 |
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| 68 | boost::posix_time::ptime finish = boost::posix_time::microsec_clock::universal_time();
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| 69 | boost::posix_time::time_duration dur = finish - start;
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| 70 | std::cout << typeName << dur.total_microseconds() << std::endl;
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| 71 | }
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| 72 |
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| 73 |
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| 74 |
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| 75 |
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| 76 |
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| 77 | int main(int argc, char * argv[])
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| 78 | {
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| 79 |
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| 80 | std::cout << "using " << MAX_ITER << " iterations..." << std::endl;
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| 81 | test_lexical_cast<int>( "test_lexical_cast int: ");
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| 82 | test_lexical_cast<std::string>( "test_lexical_cast: std::string: ");
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| 83 | test_my_lexical_cast<int>( "test_my_lexical_cast: int: ");
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| 84 | test_my_lexical_cast<std::string>( "test_my_lexical_cast: std::string: ");
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| 85 |
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| 86 | std::cout << "done";
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| 87 |
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| 88 |
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| 89 | return 0;
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| 90 | }
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