The make process encountered error when compiling lib/manip.cpp with
following error messages:

manip.cpp: In function `mysqlpp::SQLQueryParms&
mysqlpp:perator<<(mysqlpp::quote_type2, mysqlpp::SQLString&)':
manip.cpp:60: error: conversion from `stlp_priv::__bstr_sum<char,
stlp_std::char_traits<char>, stlp_std::allocator<char>,
stlp_priv::__bstr_sum<char, stlp_std::char_traits<char>,
stlp_std::allocator<char>, stlp_priv::__char_wrapper<char>,
stlp_priv::__bstr_sum<char, stlp_std::char_traits<char>,
stlp_std::allocator<char>, stlp_priv::__bstr_wrapper<char,
stlp_std::char_traits<char>, stlp_std::allocator<char> >,
stlp_priv::__sum_storage_elem<char, stlp_std::char_traits<char>,
stlp_std::allocator<char> >, stlp_priv::__on_right>,
stlp_priv::__on_right>, stlp_priv::__char_wrapper<char>,
stlp_priv::__on_left>' to non-scalar type `mysqlpp::SQLString' requested
manip.cpp:68: error: conversion from `stlp_priv::__bstr_sum<char,
stlp_std::char_traits<char>, stlp_std::allocator<char>,
stlp_priv::__bstr_sum<char, stlp_std::char_traits<char>,
stlp_std::allocator<char>, stlp_priv::__bstr_wrapper<char,
stlp_std::char_traits<char>, stlp_std::allocator<char> >,
stlp_priv::__bstr_sum<char, stlp_std::char_traits<char>,
stlp_std::allocator<char>, stlp_priv::__cstr_wrapper<char>,
stlp_priv::__sum_storage_elem<char, stlp_std::char_traits<char>,
stlp_std::allocator<char> >, stlp_priv::__on_right>,
stlp_priv::__on_right>, stlp_priv::__char_wrapper<char>,
stlp_priv::__on_left>' to non-scalar type `mysqlpp::SQLString' requested
manip.cpp: In function `mysqlpp::SQLQueryParms&
mysqlpp:perator<<(mysqlpp::quote_only_type2, mysqlpp::SQLString&)':
manip.cpp:308: error: conversion from `stlp_priv::__bstr_sum<char,
stlp_std::char_traits<char>, stlp_std::allocator<char>,
stlp_priv::__bstr_sum<char, stlp_std::char_traits<char>,
stlp_std::allocator<char>, stlp_priv::__char_wrapper<char>,
stlp_priv::__bstr_sum<char, stlp_std::char_traits<char>,
stlp_std::allocator<char>, stlp_priv::__bstr_wrapper<char,
stlp_std::char_traits<char>, stlp_std::allocator<char> >,
stlp_priv::__sum_storage_elem<char, stlp_std::char_traits<char>,
stlp_std::allocator<char> >, stlp_priv::__on_right>,
stlp_priv::__on_right>, stlp_priv::__char_wrapper<char>,
stlp_priv::__on_left>' to non-scalar type `mysqlpp::SQLString' requested
manip.cpp: In function `mysqlpp::SQLQueryParms&
mysqlpp:perator<<(mysqlpp::quote_double_only_typ e2, mysqlpp::SQLString&)':
manip.cpp:366: error: conversion from `stlp_priv::__bstr_sum<char,
stlp_std::char_traits<char>, stlp_std::allocator<char>,
stlp_priv::__bstr_sum<char, stlp_std::char_traits<char>,
stlp_std::allocator<char>, stlp_priv::__cstr_wrapper<char>,
stlp_priv::__bstr_sum<char, stlp_std::char_traits<char>,
stlp_std::allocator<char>, stlp_priv::__bstr_wrapper<char,
stlp_std::char_traits<char>, stlp_std::allocator<char> >,
stlp_priv::__sum_storage_elem<char, stlp_std::char_traits<char>,
stlp_std::allocator<char> >, stlp_priv::__on_right>,
stlp_priv::__on_right>, stlp_priv::__cstr_wrapper<char>,
stlp_priv::__on_left>' to non-scalar type `mysqlpp::SQLString' requested
mingw32-make[1]: *** [mysqlpp_manip.o] Error 1
mingw32-make: *** [lib] Error 2

It seems caused by a different design of basic_string in STLport which I
cannot confirm, and the built-in MinGW libstdc++ built mysql++ 2.1.1
without pain. I tried to change the code by making a temporary
std::string first and then assign it to mysqlpp::SQLString and it worked.

Whether it is a problem of not-conformant-string-implementation in
STLport or a not-complete-implementation of mysqlpp::SQLString? Should
mysql++ team make a patch? Or should I forward this problem to the
STLport team?

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dengxy (AT) cse (DOT) buaa.edu.cn wrote:
....spam, spam, spam, spam....Ain't STL error messages lovely?

No, you should send your patch to the list, and let me decide whether to
apply it or not.

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Warren Young дµÀ:
I should have more investigation to decide what to do.

Hope anyone else will provide more detailed information.

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I send a message on the STLport mailing list, and its developer said:


and I found the flag _STLP_DONT_USE_TEMPLATE_EXPRESSION at
stlport/stl/config/user_config.h, and I uncomment this line and rebuilt
STLport and then compile mysql++ linking with it, and this time
everything goes fine.

Hope STLport developer will eliminate this template expression drawback
and regain the efficiency of template expression.

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dengxy (AT) cse (DOT) buaa.edu.cn wrote:
Thanks for the report!

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To Warren Young:

Francois Dumont, the STLport developer, also provide another walk around
today that makes it work with the template expression feature, which
gains superior performance when concatenating std::strings using
operator+ in STLport, however, at a cost to produce default SQLString
objects in manip.cpp.

Here is the patch using his walk around:
*************patch begin***************


--- mysql++/lib/manip.cpp 2006-04-05 12:44:49.000000000 +0800
+++ ./manip.cpp 2006-06-09 11:26:38.347625000 +0800
@@ -56,8 +56,9 @@
SQLQueryParms& operator <<(quote_type2 p, SQLString& in)
{
if (in.is_string) {
+ SQLString in2;
if (in.dont_escape) {
- SQLString in2 = '\'' + in + '\'';
+ in2 = '\'' + in + '\'';
in2.processed = true;
return *p.qparms << in2;
}
@@ -65,7 +66,7 @@
char* s = new char[in.size() * 2 + 1];
mysql_escape_string(s, in.c_str(),
static_cast<unsigned long>(in.size()));
- SQLString in2 = SQLString('\'') + s + '\'';
+ in2 = SQLString('\'') + s + '\'';
in2.processed = true;
*p.qparms << in2;
delete[] s;
@@ -305,7 +306,8 @@
SQLQueryParms& operator <<(quote_only_type2 p, SQLString& in)
{
if (in.is_string) {
- SQLString in2 = '\'' + in + '\'';
+ SQLString in2;
+ in2 = '\'' + in + '\'';
in2.processed = true;
return *p.qparms << in2;
}
@@ -363,7 +365,8 @@
SQLQueryParms& operator <<(quote_double_only_type2 p, SQLString& in)
{
if (in.is_string) {
- SQLString in2 = "\"" + in + "\"";
+ SQLString in2;
+ in2 = "\"" + in + "\"";
in2.processed = true;
return *p.qparms << in2;
}


*************patch end***************
By this patch applied, STLport can compile mysql++ without problem, too!
However, it is you who decide whether to use this patch

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dengxy (AT) cse (DOT) buaa.edu.cn wrote:
I don't find it objectionable. I've applied it. Thanks!

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