| .. Metafunctions/String Operations//c_str |10 |
| |
| |
| c_str |
| ===== |
| |
| Synopsis |
| -------- |
| |
| .. parsed-literal:: |
| |
| template< |
| typename Sequence |
| > |
| struct c_str |
| { |
| typedef |unspecified| type; |
| static char const value[]; |
| }; |
| |
| |
| Description |
| ----------- |
| |
| ``c_str`` converts the |Forward Sequence| of |Integral Constant|\ s ``Sequence`` |
| into a null-terminated byte string containing an equivalent sequence. |
| |
| |
| Header |
| ------ |
| |
| .. parsed-literal:: |
| |
| #include <boost/mpl/string.hpp> |
| |
| |
| Model of |
| -------- |
| |
| |Metafunction| |
| |
| |
| Parameters |
| ---------- |
| |
| +---------------+---------------------------+-----------------------------------------------+ |
| | Parameter | Requirement | Description | |
| +===============+===========================+===============================================+ |
| | ``Sequence`` | |Forward Sequence| of | A sequence to be converted into a | |
| | | |Integral Constant|\ s | null-terminated byte string. | |
| +---------------+---------------------------+-----------------------------------------------+ |
| |
| |
| Expression semantics |
| -------------------- |
| |
| .. compound:: |
| :class: expression-semantics |
| |
| For any |Forward Sequence| of |Integral Constant|\ s ``s``, |
| |
| .. parsed-literal:: |
| |
| c_str<s>::value; |
| |
| :Return type: |
| A null-terminated byte string. |
| |
| :Precondition: |
| ``size<s>::value <= BOOST_MPL_STRING_MAX_LENGTH``. |
| |
| :Semantics: |
| Equivalent to |
| |
| .. parsed-literal:: |
| |
| char const value[] = { |
| at<s, 0>::type::value |
| , ... |
| , at<s, size<s>::value-1>::type::value |
| , '\\0' |
| }; |
| |
| Complexity |
| ---------- |
| |
| +-------------------------------+-----------------------------------+ |
| | Sequence archetype | Complexity | |
| +===============================+===================================+ |
| | |Forward Sequence| | Linear. | |
| +-------------------------------+-----------------------------------+ |
| |
| Example |
| ------- |
| |
| .. parsed-literal:: |
| |
| typedef vector_c<char,'h','e','l','l','o'> hello; |
| assert( 0 == std::strcmp( c_str<hello>::value, "hello" ) ); |
| |
| See also |
| -------- |
| |
| |Forward Sequence|, |Integral Constant|, |string| |
| |
| |
| .. copyright:: Copyright © 2009 Eric Niebler |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
