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See what MSVC says in case of an invalid conversion

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rbock 2015-12-28 18:24:59 +01:00
parent 0a77c73e1d
commit cda1249b69
3 changed files with 14 additions and 6 deletions
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5
include/sqlpp11/result_field_base.h
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@ -33,6 +33,7 @@
#include <sqlpp11/result_field.h> #include <sqlpp11/result_field.h>
#include <sqlpp11/exception.h> #include <sqlpp11/exception.h>
#include <sqlpp11/type_traits.h> #include <sqlpp11/type_traits.h>
#include <sqlpp11/bad_statement.h>
namespace sqlpp namespace sqlpp
{ {
@ -115,7 +116,9 @@ namespace sqlpp
return _value; return _value;
} }
operator _cpp_value_type() const operator typename std::conditional<_null_is_trivial or (not _can_be_null::value),
_cpp_value_type,
bad_statement>::type() const
{ {
return value(); return value();
} }

2
test_constraints/CMakeLists.txt
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@ -33,6 +33,8 @@ function(test_constraint name pattern)
set_property(TEST ${test} PROPERTY PASS_REGULAR_EXPRESSION ${pattern}) set_property(TEST ${test} PROPERTY PASS_REGULAR_EXPRESSION ${pattern})
endfunction() endfunction()
add_executable(see_what_happens no_conversion_operator_if_null_not_trivial.cpp)
target_link_libraries(see_what_happens PRIVATE sqlpp11 sqlpp11_testing)
test_constraint(count_of_count "count\\(\\) cannot be used on an aggregate function") test_constraint(count_of_count "count\\(\\) cannot be used on an aggregate function")
test_constraint(max_of_max "max\\(\\) cannot be used on an aggregate function") test_constraint(max_of_max "max\\(\\) cannot be used on an aggregate function")
test_constraint(no_conversion_operator_if_null_not_trivial "int i = row.alpha") test_constraint(no_conversion_operator_if_null_not_trivial "int i = row.alpha")

11
tests/Function.cpp
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@ -286,7 +286,7 @@ int Function(int, char*[])
static_assert(sqlpp::is_integral_t<TT>::value, "type requirement"); static_assert(sqlpp::is_integral_t<TT>::value, "type requirement");
static_assert(not sqlpp::is_floating_point_t<TT>::value, "type requirement"); static_assert(not sqlpp::is_floating_point_t<TT>::value, "type requirement");
if (false and db(select(count(t.alpha)).from(t).where(true)).front().count) if (false and db(select(count(t.alpha)).from(t).where(true)).front().count > 0)
{ /* do something */ { /* do something */
} }
} }
@ -446,11 +446,14 @@ int Function(int, char*[])
for (const auto& row : db(select(all_of(t)).from(t).where(true))) for (const auto& row : db(select(all_of(t)).from(t).where(true)))
{ {
static_assert(std::is_same<decltype(sqlpp::tvin(row.alpha)), sqlpp::tvin_arg_t<typename std::remove_const<decltype(row.alpha)>::type>>::value, static_assert(std::is_same<decltype(sqlpp::tvin(row.alpha)),
sqlpp::tvin_arg_t<typename std::remove_const<decltype(row.alpha)>::type>>::value,
"result fields are accepted and not wrapped"); "result fields are accepted and not wrapped");
static_assert(std::is_same<decltype(sqlpp::tvin(row.beta)), sqlpp::tvin_arg_t<typename std::remove_const<decltype(row.beta)>::type>>::value, static_assert(std::is_same<decltype(sqlpp::tvin(row.beta)),
sqlpp::tvin_arg_t<typename std::remove_const<decltype(row.beta)>::type>>::value,
"result fields are accepted and not wrapped"); "result fields are accepted and not wrapped");
static_assert(std::is_same<decltype(sqlpp::tvin(row.gamma)), sqlpp::tvin_arg_t<typename std::remove_const<decltype(row.gamma)>::type>>::value, static_assert(std::is_same<decltype(sqlpp::tvin(row.gamma)),
sqlpp::tvin_arg_t<typename std::remove_const<decltype(row.gamma)>::type>>::value,
"result fields are accepted and not wrapped"); "result fields are accepted and not wrapped");
} }
} }