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tests: c++: use a custom string type

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The forthcoming automove feature, to be properly checked, will require
that we can rely on the value of a moved-from string, which is not
something the C++ standard guarantees.  So introduce our own wrapper.

Suggested by Frank Heckenbach.
https://lists.gnu.org/archive/html/bison-patches/2018-09/msg00111.html

* tests/c++.at (Variants): Introduce and use a new 'string' class.
This commit is contained in:
Akim Demaille
2018-09-22 08:47:42 +02:00
parent 21eeee46e9
commit aa5de5728c
1 changed files with 38 additions and 11 deletions
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49
tests/c++.at
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@@ -222,8 +222,36 @@ AT_DATA_GRAMMAR([list.y],
#include <sstream>
#include <string>
class string
{
public:
string () {}
typedef std::vector<std::string> strings_type;
string (const std::string& s)
: val_(s)
{}
string (const string& s)
: val_(s.val_)
{}
string& operator= (const string& s)
{
val_ = s.val_;
return *this;
}
friend
std::ostream& operator<< (std::ostream& o, const string& s)
{
return o << s.val_;
}
private:
std::string val_;
};
typedef std::vector<string> strings_type;
namespace yy
{
@@ -255,31 +283,30 @@ AT_DATA_GRAMMAR([list.y],
// Conversion to string.
template <typename T>
inline
std::string
string
to_string (const T& t)
{
std::ostringstream o;
o << t;
return o.str ();
return string (o.str ());
}
}
}
%token <::std::string> TEXT;
%token <::string> TEXT;
%token <int> NUMBER;
%token END_OF_FILE 0;
%token COMMA ","
%type <::std::string> item;
// Using the template type to exercize its parsing.
// Starting with :: to ensure we don't output "<::" which starts by the
// digraph for the left square bracket.
%type <::std::vector<std::string>> list;
%type <::string> item;
// Using the template type to exercize its parsing.
%type <::std::vector<string>> list;
%printer { yyo << $$; }
<int> <::std::string> <::std::vector<std::string>>;
%printer { yyo << $$; } <int> <::string> <::std::vector<string>>;
%destructor { std::cerr << "Destroy: " << $$ << '\n'; } <*>;
%destructor { std::cerr << "Destroy: \"" << $$ << "\"\n"; } <::std::string>;
%destructor { std::cerr << "Destroy: \"" << $$ << "\"\n"; } <::string>;
%%
result:
@@ -343,7 +370,7 @@ namespace yy
else
{]AT_TOKEN_CTOR_IF([[
return parser::make_TEXT (to_string (stage)]AT_LOCATION_IF([, location ()])[);]], [[
yylval->BUILD (std::string, to_string (stage));]AT_LOCATION_IF([
yylval->BUILD (string, to_string (stage));]AT_LOCATION_IF([
*yylloc = location ();])[
return parser::token::TEXT;]])[
}