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added BOOST_[APPEND_]TEMPLATE_EXPLICITLY_SPECIFIED_[NON_]TYPE

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[SVN r18272]
This commit is contained in:
Gennaro Prota
2003-04-16 23:39:37 +00:00
parent b22c9ced68
commit 648b777160
1 changed files with 66 additions and 0 deletions
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66
include/boost/config/suffix.hpp
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@ -337,6 +337,72 @@ namespace std {
# define BOOST_DEDUCED_TYPENAME
#endif
// BOOST_[APPEND_]TEMPLATE_EXPLICITLY_SPECIFIED_[NON_]TYPE macros -------------//
//
// Some compilers have problems with function templates whose
// template parameters don't appear in the function parameter list.
//
// Basically they just link one instantiation of the template in
// the final executable.
// Example:
//
// #include <iostream>
// #include <ostream>
//
// template <int n>
// void f() { std::cout << n << '\n'; }
// int main() {
// f<1>();
// f<2>();
// }
//
// OUTPUT is:
//
// 2
// 2
//
// Write the definition of f as
//
// template <int n>
// void f(BOOST_TEMPLATE_EXPLICITLY_SPECIFIED_NON_TYPE(int, n))
// { std::cout << n << '\n'; }
#if defined BOOST_NO_EXPLICIT_FUNCTION_TEMPLATE_ARGUMENTS
# include "boost/type.hpp"
# include "boost/non_type.hpp"
// For type parameters
#define BOOST_TEMPLATE_EXPLICITLY_SPECIFIED_TYPE(t) \
boost::type<t>* = 0
#define BOOST_APPEND_TEMPLATE_EXPLICITLY_SPECIFIED_TYPE(t) \
, BOOST_TEMPLATE_EXPLICITLY_SPECIFIED_TYPE(t)
// For non-type parameters
//
#define BOOST_TEMPLATE_EXPLICITLY_SPECIFIED_NON_TYPE(t, v) \
boost::non_type<t, v>* = 0
#define BOOST_APPEND_TEMPLATE_EXPLICITLY_SPECIFIED_NON_TYPE(t, v) \
, BOOST_TEMPLATE_EXPLICITLY_SPECIFIED_NON_TYPE(t, v)
#else
// no workaround needed: expand to nothing
#define BOOST_TEMPLATE_EXPLICITLY_SPECIFIED_TYPE(t)
#define BOOST_APPEND_TEMPLATE_EXPLICITLY_SPECIFIED_TYPE(t)
#define BOOST_TEMPLATE_EXPLICITLY_SPECIFIED_NON_TYPE(t, v)
#define BOOST_APPEND_TEMPLATE_EXPLICITLY_SPECIFIED_NON_TYPE(t, v)
#endif // defined BOOST_NO_EXPLICIT_FUNCTION_TEMPLATE_ARGUMENTS
// ---------------------------------------------------------------------------//
//