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std::invalid_argument::invalid_argument

Parameters

Exceptions

Notes

Because copying std::invalid_argument is not permitted to throw exceptions, this message is typically stored internally as a separately-allocated reference-counted string. This is also why there is no constructor taking std::string&&: it would have to copy the content anyway.

Before the resolution of LWG issue 254, the non-copy constructor can only accept std::string . It makes dynamic allocation mandatory in order to construct a std::string object.

After the resolution of LWG issue 471, a derived standard exception class must have a publicly accessible copy constructor. It can be implicitly defined as long as the explanatory strings obtained by what() are the same for the original object and the copied object.

std::invalid_argument::operator=

Assigns the contents with those of other. If *this and other both have dynamic type std::invalid_argument then std::strcmp (what(), other.what()) == 0 after assignment. No exception can be thrown from the copy assignment operator.

Parameters

Return value

*this

Notes

After the resolution of LWG issue 471, a derived standard exception class must have a publicly accessible copy assignment operator. It can be implicitly defined as long as the explanatory strings obtained by what() are the same for the original object and the copied object.

Inherited from std::logic_error

Inherited from std::exception

Member functions

#include <bitset>
#include <iostream>
#include <stdexcept>
#include <string>
 
int main()
{
 try
 {
 std::bitset <4>{"012"}; // Throws: only '0' or '1' expected
 }
 catch (std::invalid_argument const& ex)
 {
 std::cout << "#1: " << ex.what() << '\n';
 }
 
 try
 {
 [[maybe_unused]] int f = std::stoi ("ABBA"); // Throws: no conversion
 }
 catch (std::invalid_argument const& ex)
 {
 std::cout << "#2: " << ex.what() << '\n';
 }
 
 try
 {
 [[maybe_unused]] float f = std::stof ("(3.14)"); // Throws: no conversion
 }
 catch (std::invalid_argument const& ex)
 {
 std::cout << "#3: " << ex.what() << '\n';
 }
}

Possible output:

#1: bitset string ctor has invalid argument
#2: stoi: no conversion
#3: stof: no conversion