catch2/projects/SelfTest/ToStringWhich.cpp

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#include "catch.hpp"
/*
Demonstrate which version of toString/StringMaker is being used
for various types
*/
struct has_operator { };
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struct has_maker {};
struct has_maker_and_operator {};
std::ostream& operator<<(std::ostream& os, const has_operator&) {
os << "operator<<( has_operator )";
return os;
}
std::ostream& operator<<(std::ostream& os, const has_maker_and_operator&) {
os << "operator<<( has_maker_and_operator )";
return os;
}
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namespace Catch {
template<>
struct StringMaker<has_maker> {
static std::string convert( const has_maker& ) {
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return "StringMaker<has_maker>";
}
};
template<>
struct StringMaker<has_maker_and_operator> {
static std::string convert( const has_maker_and_operator& ) {
return "StringMaker<has_maker_and_operator>";
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}
};
}
// Call the operator
TEST_CASE( "stringify( has_operator )", "[toString]" ) {
has_operator item;
REQUIRE( ::Catch::Detail::stringify( item ) == "operator<<( has_operator )" );
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}
// Call the stringmaker
TEST_CASE( "stringify( has_maker )", "[toString]" ) {
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has_maker item;
REQUIRE( ::Catch::Detail::stringify( item ) == "StringMaker<has_maker>" );
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}
// Call the stringmaker
TEST_CASE( "stringify( has_maker_and_toString )", "[.][toString]" ) {
has_maker_and_operator item;
REQUIRE( ::Catch::Detail::stringify( item ) == "StringMaker<has_maker_and_operator>" );
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}
// Vectors...
// Don't run this in approval tests as it is sensitive to two phase lookup differences
TEST_CASE( "toString( vectors<has_toString )", "[.][toString][!nonportable]" ) {
std::vector<has_operator> v(1);
REQUIRE( ::Catch::Detail::stringify( v ) == "{ operator<<( has_operator ) }" );
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}
TEST_CASE( "toString( vectors<has_maker )", "[toString]" ) {
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std::vector<has_maker> v(1);
REQUIRE( ::Catch::Detail::stringify( v ) == "{ StringMaker<has_maker> }" );
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}
// Don't run this in approval tests as it is sensitive to two phase lookup differences
TEST_CASE( "toString( vectors<has_maker_and_toString )", "[.][toString][!nonportable]" ) {
std::vector<has_maker_and_operator> v(1);
REQUIRE( ::Catch::Detail::stringify( v ) == "{ StringMaker<has_maker_and_toString> }" );
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}