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Improved error messages for incorrect parameters.

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This commit is contained in:
rbock
2014-03-26 21:01:16 +01:00
parent a38a9d6f65
commit 1c95406ced
2 changed files with 17 additions and 1 deletions
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14
include/sqlpp11/alias_provider.h
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@@ -27,6 +27,8 @@
#ifndef SQLPP_ALIAS_PROVIDER_H
#define SQLPP_ALIAS_PROVIDER_H
#include <type_traits>
#define SQLPP_ALIAS_PROVIDER(name) \
struct name##_t\
{\
@@ -46,6 +48,18 @@
namespace sqlpp
{
template<typename T, typename Enable = void>
struct is_alias_provider_t
{
static constexpr bool value = false;
};
template<typename T>
struct is_alias_provider_t<T, typename std::enable_if<std::is_class<typename T::_name_t::template _member_t<int>>::value, void>::type>
{
static constexpr bool value = true;
};
namespace alias
{
SQLPP_ALIAS_PROVIDER(a);

4
include/sqlpp11/parameter.h
View File

@@ -35,7 +35,6 @@ namespace sqlpp
template<typename ValueType, typename NameType>
struct parameter_t: public ValueType::template expression_operators<parameter_t<ValueType, NameType>>
{
#warning need to check that Value Type is an SQL value type!
struct _value_type: public ValueType
{
using _is_expression = std::true_type;
@@ -74,6 +73,7 @@ namespace sqlpp
auto parameter(const NamedExpr&)
-> parameter_t<typename NamedExpr::_value_type, NamedExpr>
{
static_assert(is_named_expression_t<NamedExpr>::value, "not a named expression");
return {};
}
@@ -81,6 +81,8 @@ namespace sqlpp
auto parameter(const ValueType&, const AliasProvider&)
-> parameter_t<ValueType, AliasProvider>
{
static_assert(is_expression_t<ValueType>::value, "first argument is not an expression");
static_assert(is_alias_provider_t<AliasProvider>::value, "second argument is not an alias provider");
return {};
}